10 Interview RIDDLES || Episode #4 || Quick & Tricky
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- čas přidán 27. 07. 2018
- 10 Most frequently asked quick and tricky JOB INTERVIEW RIDDLES based on lateral logic. Quick and Tricky Puzzles that will surely surprise you. This is the fourth episode of the interview Puzzles and Riddles series.
Also watch:
10 interview riddles || Episode #1 :
• 10 Interview RIDDLES |...
5 interview Puzzles || Episode #2 :
• 5 Interview PUZZLES ||...
10 Interview RIDDLES || Episode #3 || Intelligence Test
• 10 Interview RIDDLES |...
Make sure you pause the video after every puzzle statement, and try to solve it yourself.
You can find Interview Puzzles and difficult logical puzzles generally asked in Puzzle competitions, on my channel.
List of the Riddles covered in this Episode#3:
1 - Tricky Calculation (Divide 30 by half and add 10)
2 - 4 coins arrangement (Arrange four coins so that each )coin should touch every other coin)
3 - What is he buying (customer on a hardware store, buys 112 for sixty cents)
4 - 9 coins (Change the diamond square shape to triangle) .
5 - 3 matches (make 4 out of these three matchsticks).
6 - two squares (remove two matches to get two squares)
7 - Pool ball riddle (place 3 balls to make the sum 30)
8 - 3 squares (move three matches to make three squares)
9 - Cake for eight (cut the cake in 8 equal pieces with just 3 straight cuts )
10 - 9 coins triangle - again (another approach to riddle 4)
The video explains the solution to all the Puzzles and the Logic behind.
Please comment below your answers and suggestions. Also LIKE the video and SUBSCRIBE to my channel if you are new.
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2 min silence for those who divided 30 by 15
PS : i divided it by 0.5 and my answer is 60(before adding 12).
Final ans - 72
Yash Shrivas can I get 1 min of silence for dividing 30 by 15?
@@spookydaily6590
Same
Yeah no idea how they got that answer I guess we’re just wrong :/
@@spookydaily6590
By half, they mean the literal 1/2, not half of 30
Ah thanks
Who got 72 on a first look at question
I
i didn't get it (i got 27)
I
at first I thought half means 15 but then I realized 1/2 is equal to 0.5...
I
Riddle 9
Cut 1 - horizontal cut
Cut 2 - vertical cut
Place the 4 pieces on each another then a cut at 45° angle.
U had seen in bikral and gabral😂!!?
Don’t you mean 90 degrees
So for a cake you will use your protractor ??
Bruh Moment. If you have a circular cake it is 360 degrees. if you divide it into four bits, one bit becomes 90 degrees to 360/4 = 90. So if you are going to split them in the middle, take 90/2 = 45. So 45 degrees is right.
LOL
4:17 The video, making it into the symbol for four
Me, who made a roman numeral:
Me too
I V
I did
same
Same tho
#9 can be done this way as well:
Cut horizontal,
Cut vertical,
Put the pieces directly on top of each other and cut in half again.
Since no one said I couldn't move the pieces 😂
Mark Jacobs ...or before the last cut, instead of stacking them, line them up point to round back. There’s so many ways to get the same answer.
To beat this CZcamsr's logic, it's actually impossible for us to cut 8 equal pieces, because anything produced by human means will have a margin of error, thus the impossibility of properly dividing the cake in 8.
@@brandyndaigneault1758 it's possible, just requires a few dozen of cakes to have 1 accidentally cut just right xD
And that is in fact the superior way because not only is it much more difficult to cut a cake through the side, but people also usually prefer taller narrower slices to shorter wider slices.
F*ing weeb
Finally! I found a video which has a question given in the thumbnail!
He. He...
Lol... nice one bro
I know right. Not like one of those Brightside thumbnails so annoying
Yeah...
Bonus question is phrased a bit fuzzy.
AS ASKED, the answer is 4. the first 4 balls drawn *could* be the same color.
But I assume he means "What's the minimum number of balls you must draw at random to BE CERTAIN to have four same colored balls drawn?"
Then the worst-case scenario is where you draw 3 of each before getting a 4th, thus 13 balls total.
Most of the questions use deceptive phrasing. It's not just the bonus question.
Ans Should Be 4 AS ITS NOT MENTIONED THAT YOU CAN'T LOOK INSIDE DUH...
@@computernerd1101 Ans Should Be 4 AS ITS NOT MENTIONED THAT YOU CAN'T LOOK INSIDE DUH...\
I got 13 as well
never over complicate a question like that, it's the easiest way to get it wrong. The phrasing of the question is important, it only asks for the minimum amount needed to draw 4, the answer would be 4, the question never says that you have to be certain you will get 4 of the same colour.
If my boss asks me to divide 30 by half and the intended operation is 30 divided by one half then I change boss
That would be a good time to ask, “Divide IN half, or divide BY half?”
@@alienrocketscienceshared8454
That's what I got immediately (30/15=2+12=14), but this is kinda trick question..like this guy said above, they should say divide by ONE half, not just by half ..I wanna throw up when I see those smartasses that pretend getting 72 immediately, someone probably, but thousands of today's brainwashed people, right my arse lol
Which English? American English? It makes a difference.
@@johnchestnut5340
???
@@CarpeDiem23 Word problems are based upon communication with language. Change the rules...change the problem. Divided by half, divided by one half, and divided into halves can be different ways of saying the same thing or different things. How you interpret the question determines the answer. If you solve the wrong question, that's a communication problem...NOT a math error. Different cultures can use different conventions even with extremely similar vocabularies...seemingly the same languages.
4:17 alternative solution: IV (Roman numerals)
Out of box thinking, well done bro
@@shoemeow thx mate :)
Wrong. It doesn't ask for 'IV' or '4' it asks for 'four.'
@@braceyourselvesfortruth2492 Everything is good until theres someone who ruins the cool answer
@@hamster8706 it's the wrong answer
I thought Roman IV for the 3 matches making a 4.
Rob L genius
Your Roman IV works for me too, and you're 100% correct! Thanks for pointing it out!
Actually, making a 4 and IV are both wrong. The riddle said "four." Correct answer is breaking 1/4 of each of the three off and making a new stick with that one. Then they will all be equal, 3/4th of a matchstick each.
U can make it roman VI also
Same here
If any company asked me any of these questions on an interview, I’m leaving
Haha. Yes, I would not call these logic problems - most are more like tricks.
Really? ... If the actual work was as easy and fun, I'd try to ace these questions, convince the company to pay a premium for a 'genius' like me, and coast my way to senior mgmt.
@@nkabbi Nope, if a company is asking "gotcha" questions like these, it's either because they're looking for reasons to be able to say no to people, or because the person hiring doesn't have any idea how to hold a real interview.
@@TheFizzster wise... I didn't think of that. Thx
@@TheFizzster what if they ask you these just as an ice breaker or something?
The 'minimum' number of balls to draw would be 4, that's the minimum number to get 4 the same.
The minimum number you have to draw to 'ensure' you get 4 of the same would be 13.
Could u explain how 13?
@@sachinmotwani2905 3 of each... the 13 one will make 4 of one
He said minimum sir
Just take out the LCM and that's 840
Yes 13 will be correct by pigeon hole principle
Me to a shopkeeper: Do you have a card with the words “You are my one true love written on it”
Shopkeeper : yes, I do
Me: I want 15 of them
🤣🤣🤣🤣🤣🤣
you are using quotes inaccurately.
Me to a shopkeeper: Do you have a card with the words “You are my one true love" written on it
@@laxris I also spotted that faux pas.
Me a dreamer: With this video I’m gonna ace any tricky interview that may come my way!
Interviewer: Tell me about a time when you faced a challenging situation.
Me: 0.0
John Murphy That is the hardest interview question ever. Who da fk came up with that question!!!🤔🤦🏽♂️🤣😂
Well... I was watching this youtube video about interview riddles once...
I was actually asked this question. Without hesitating I said, "Right now! Trying to come up with an answer." He laughed and said that was the best answer he ever heard. He called the next day to tell me I was hired.
@@AFmedic lol! Thanks for the technique
@@AFmedic Lol this could be the best answer to tackle that situation I am gonna give it a try
I once was on an interview where they asked tricky questions. Imagine their surprise when I proved to them that my answer was correct and their answer was wrong. I got the job, then left one week later for better pay somewhere else.
Should not ask but what's ur age and ur job? 🤓
@@sanchit6107 I'm an electronics technician, and the tricky question was not calculated correctly by the company. Electronics can rely heavily on math, or maths depending on what part of the world you are in.
@Growly Bear what's the question?
@@arjuna459 I would have to draw you a schematic diagram, but basically they had a circuit with a DC source, a capacitor and a load resistor, plus some other stuff. They stated that the voltage across the resistor should be zero because all of the DC was blocked by the capacitor, but I told them there would be a sudden spike of voltage while the cap was charging up after switching on the DC source, and it would settle down to zero in a short time. Not real tricky stuff, but the guy was not anticipating the college answer.
@@GrowlyBear917 Math does not depend on what part of the world you are in. Math is universal. Now, people may be educated incorrectly in certain parts of the world, but MATH is universal and not dependent on geography.
There's a third solution to the 9 coins riddle. No one says it has to make an isosceles triangle, so take these 2 coins:
O O O
O O O
O(O O)
And move them like this:
O O O O O
O O O
O
I did this.
OK .now where is this triangle that we have to make ..
I have 4th solution. (what?)
O
O O
O O O
(O) (O)
O
Then
O
O O
O O O
(O) O (O)
It's like a basic java programming riddles.
Exactly this one on the first look
4 can be as IV also with 3 matchsticks
Alokparna Ghosh correct
Alokparna Ghosh nice
Yeah
😮 you have became scientist!
I thought the same
Lmao. I got question 10’s answer when answering the first triangle question.
Haha.. Me too
Me too
Me too😏
Same here
Same
Bonus question: What is the minimum number of balls you must draw at random to get four same colored balls?
It doesn’t say the minimum to guarantee you get 4 the same. You could theoretically get 4 same colored on your first four draws. So the minimum is 4.
Yeah for questions that require such precisely exact language such as question 1, some of the wording is pretty vague and imprecise.
My answer to question 1 is 'It depends on what is meant, either 27 or 72'. Very often the end user will say the wrong thing but want you to do what they meant anyway. Doing exactly what they say is wrong.
@@magicmerl7749 If it said divide 30 IN half then add 12, 27 would be correct, but it says divide 30 BY half then add 12 so 72 is correct. It's not really a maths question it's more an English question! :-)
@@DeanLee1 Exactly. It's a word trick and within the context of interviewing someone to hire them, the RIGHT answer is to clarify with the client what they actually mean, rather than go with what is most technically accurate.
how can you get 4 balls of the same color if you pick it by random?
@@reynardvien6873 chance.
These “interview questions” say more about the interviewer (and company culture) than it will about the person being interviewed.
I have to say I seriously doubt that anybody would ask you this on an interview
And your reaction in this way says something about you too
@@davidandrs3535 did get asked the first one on a bank training course and you'd be surprised how many people got it wrong. The test was more about logic than maths and about attention to detail as they wanted people to spot the preposition 'by' instead of 'in' [half]
@@casmartin790 Half is technically not a value one half is so the correct answer is not enough information.
@@jeremyjimenez7858 I agree. I guess it can be assumed that if it is asking for a half, it is going to be a half of one, for example, a person says there's 1 and a half pizzas in the kitchen you'd assume there's is going to be a whole pizza and less than whole pizza. If someone says, there's 70 and a half of whatever, chances are you wouldn't assume the person meant there are 105 of whatever (70 + half of 70 (35) =105) I'm not sure of this comes across as intended but I hope you see my point.
They are not equal pieces of cake if you cut through it horizontally! Nobody wants the "stump" of the cake; the cake top is where its at!
That's nice
my solution was that for the third cut, you stack the 4 pieces on top of each other
Thats why I didn't consider cutting in middle. But the cake they showed as image didn't make a difference since it's almost same both sides. No frosting here
A better answer would be it doesn’t matter because only using 3 cuts is impractical.
It's a plan cake so it's possible
OMG......😨😨😨they will sooooooooo tricky and nice too so I will just say that keep it up😉👌👍👍👍
For the bonus question, the minimum amount required to randomly draw 4 of the same color is just 4. Its not possible to randomly draw 4 of the same color with less than 4, but it is possible to draw 4 of the same color with 4. More would increase the chances, but even with a very low chance, the minimum you would have to draw would be 4
13 balls,
In worst case...
In 1st iteration 4 balls (each different color)
Same in 2nd and 3rd also each with different colours
(total till now = 4*3 = 12 balls)
Now u just need to draw 1 more ball, that will definitely match with one of the colors
There fore
Ans = 13 balls
If max number of balls you must draw then it will be 22 balls, because it's all the ball to be very sure.
Best case ya worst case nhi batana hai
Minimum number of balls batani ki such that you 100% sure that you have 4 balls of same color
@@mohitrai968 it's 13 balls
Came to the comments thinking the answer is definitely 13. After reading your answer, I noticed the word play and think I was wrong - 4 seems to be a more accurate answer.
for bonus riddle: my answer is "13"..coz if i only draw 12 balls, the result might be 3 balls in each color...so if i will draw 1 more ball (to make it 13), definitely i will get four same colored balls....:)
It depends on whether you interpret the question as: "What is the minimum number of balls go get guaranteed 4 of the same color", or "What is the minimum number of balls to have a chance of getting 4 of the same color".
You could also argue "none at all", because you already have the balls in the bag. I think all answers are right as long as you have an explanation for it.
Yes I think your right!!! 🤗🤗🤗😊😊😊
Its 4 balls u dumbass
@@schwarzerritter5724 the guarantee is the version intended by the author. And yes 13 is right. After 12, you could fail to get 4 of the same by having 3 of each, but the 13th draw will end all suffering.
But I do agree the wording is ambiguous. It doesn't say to guarantee four same colored balls. Author should've been more explicit.
4 minimum, 13 maximum.
The best answer fits for the last question is that I just need 4 draws to get the the 4 same coloured balls. The question didn't say that I have to guarantee it 😅
Randomly draw.. and get the same color
@@susanacastroegas6375 It asks about the minimum draws needed and that is obviously 4, because you want to have 4 balls with the same colour.
@@susanacastroegas6375 It can be a low probability but still happen.
If we'd hypothetically talk about guaranteeing 4 of the same color, 13's where it's at.
Exactly 4 is the correct answer. He didn’t say that it’s a guarantee
#Riddle_5
What have you thought of making?
Only the number "4"!
I have another solution make the roman numeral 4 "IV" it is also a format from the 3 matchsticks 😊.
Ya u r right
Good
Good but the three sticks are not in contact 😂 if u replace the four with a roman numerical
@Buddy Booci he also never said that 4 should be a roman number
Or you can just cut a quarter of each and u'll obtain 4 of them having 3/4 of their original size; ez.
Bonus riddle. Its 4. Actually if i draw as many times as possible, i will always got same coloured balls.
Explanation: I am colour blind
I answered Riddle 3 differently and I think it's also correct. I stated that he was buying "stencils", 60 rupees for the 1 and the 12 and then you slide the 1 into the 12 and you have "112."
Riddle 4 I moved the middle and the bottom ones to the left and right to create a hollow triangle shape.
Riddle 7: I'm a damn pool shark and that one got me! lol
Riddle 8: I solved just moved the bottom vertical(center) away, moved the bottom horizontal right away, then moved the bottom vertical right over to center.
Riddle 10: Aaaaaand that's the moment when I bragged about my special riddle 4 technique too soon o.o
Even though it is very unlikely to draw 4 balls of the same colour at random in only 4 draws about 0,0003% (3360¯¹) there still is a chance
If you ask for minimum number of balls the answer should be 4 (i agree with the least proabaility) but if you ask for 100 percent result you should draw minimum 13 balls to surely win the game
Here is the explanation if you draw 12 balls there still is a chance that you had drawn 3 balls of each color but if you draw 13 balls, DEFINITELY you have atleaet 4 balls of the same color
@@Mini-yl8mz but they don't have to be the blue ones. Just of the same colour
13 balls... 4 being the minimum of the original pool. So to get anything more than 3 for any color.. you'll need 13.
yep, the minimum is 4... the question didnt ask for a guaranteed outcome... many of the questions here have poorly defined parameters, which may indicate that your reasoning is more important than your answer... or they are reported wrong
@@kamleshdwivedi6112 minimum number of balls you must draw to draw 4 of the same colour != minimum number of balls to guarantee to draw same colour 4 times...
and even if so its 13, not 19... if you dont believee me, tell me which constellation of 13 works
First take 1/2 then add 9 to the 3rd power, carry the 7 and multiply by hedgehog - that leaves 43 by 16 and 2 thirds or pop tarts squared.
He's speaking the language of the gods!
Mumbo Jumbo confirmed
=sacred poptarts with numbers on them
The Fact that he says "what's up LOGICAL people" and the captions says " What's up ILLOGICAL people" is hilarious. Well it's right either way hehe
First question depends on your native language a lot.
In Russian a phrase like that "поделите 30 пополам" sounds absolutelly normal and means "split 30 in 2". Likewise it would be "divide 30 by zero five" cause zero five is what we say about 0.5L of Vodka.
It is the same in English- a much more common phrase wd be "divide 30 IN half" not BY half so it is intentionally misleading,considering NORMAL patterns of speech but that's the whole point of riddles isn't it? Also lawyers decoding contracts into what they ACTUALLY say.
There is so much sloppy use of basic maths language today that many people end up talking complete nonsense but being understood by people who are used to hearing(and internally translating that nonsense into something that adds up e.g. "House no1 costs 100K.The cost of house no2 is 5 times less." - utter jibberish i.e the second house costs -400K! 1 time less = 100K less i.e. zero,etc.
I'm sure one doesn't need to be an unscrupulous conman or marketing rookie to abuse fractions in a misleading way :-)
Indeed, language can be a barrier. In this case, it is purposely done, so that one can easily make the error. Moreover, at times the wording is erroneous. What about 0,5L of tequila? ;)
n = 4
K+1 = 4
K = 4 - 1 = 3
Therefore, Kn + 1
i.e. (3×4) + 1 = 13
It's the pigeon hole concept
SToyesh Ner ,math and luck are totally different concepts
Answer is 4
Kavin Vine logic ?
4 balls....same colored ball he is asking
ashutosh sonkar but brother
See the no. of balls
They are unequal
My first answer = 3120, literally divide the number 30 in half and add a 12 in the middle ... Was pretty close from the real answer...
Woww,u r seen it differently.keep it up:-)
Bonus riddle : the worst case would be to pick out 3 balls of each color when you take 12 balls. So take 13 and you will get at least 4 balls with the same color even if you are very unlucky !
The minimum required number to get 4 balls of the same color is 4. It is mathematically possible to get 4 of the same color at the first try, but you still need to take out 4 balls.
@@Chrischi3TutorialLPs wait what????
@@francescolongo4109 Simple. The question is asking for the minimum amount of balls you need to draw at random to get 4 of the same color. Since it is theoretically possible, if unlikely to draw 4 of the same color on the first try, that is the answer. The question is not concerned with wether you are guaranteed to get 4 of the same color.
@@Chrischi3TutorialLPs Yeah, but the question isn't the minimum in which it is possible, it is the minimum which you MUST draw to get 4 balls, drawing randomly. In other words, you gotta get 4 balls, no matter how good or bad your luck is.
In other words: If you draw 4, and you don't have 4 same colored balls, then that isn't the minimum you must draw to get 4 same colored balls.
@@La4geas Yes it is. The question isnt asking for how many balls you need to draw to be guaranteed 4 of the same color. When talking probability, always look exactly at what the question is asking. I made that mistake enough times in school.
Alternate solution for #5, to make 4 with 3 matchsticks: IV. Reasoning, if all matchsticks are equal lengths, making the 4 might look weird due to sizes. IV will always work.
In fact, in IV, there's two differents sizes too....
I thought likewise, IV mate.
Not gonna lie. I was compelled to subscribe because your channel name is awesome!
Riddle 4: I used the diamond shaped square. Then moved the top and middle coins to be directly left of the (now) top left, and directly right of the (now) top right coins. This forms an upside down triangle with a space in the middle.
Edit: now I see this solution at end of vid... Oops...
Riddle 5: I made the Roman numeral 4... Or IV.
Riddle 9: I did the horizontal amd vertical cuts. Then line up all 4 big prices to make a straight cut through the middle of all 4 prices in 1 go.
Wow, i was actually right on the first one, inormaly suck at riddles, so im happy that I got it 😊
I gotta love the information omission RIddle #7 has to do just to make it tricky. Because any self respecting set of pool balls actually makes does add a distinction line in 6 and 9 in order to easily identify them, making this logic kind of pointless.
no they dont always put a line.. anyone who plays pool knows the nine ball is same color as the 1 ball yellow.
In the 9 coins question, 1 another possible solution is that if we move 2 adjacent coins from top row and put them in 3rd row such as
*
*****
*******
Please like the comment if you find the solution reasonable
It's not possible man , just think it practically just take a copy and try to draw it.
But nice try.
@@riyak1011 sorry but i didn't understand where's the confusion
Let me explain it once again
I am using numbers instead of stars here
1
2 3 4
5 6 7 8 9
This you can get the answer
@@amanaggarwal2384 I get it.Then it'll be Right Triangle. Am i right?
@@sylvoir2706 yep
@@amanaggarwal2384 oh! Ya, i think you are right .
I was lil bit confused that time now I get it. 👍
It's a right angled triangle .
The ART of THINKING by (Dr.) Silvano Borusso
... an excellent guide to thinking clearly.
It’s a deliberately ambiguous question. Depending on how one interprets “divide 30 by half”....it could be read as any of the following, without being incorrect....
“divide 30 by half (of 30)” ...30/15 ; “divide 30 by (a) half ... 30/.5. ; “ divide 30 (in) half “ ...30/2.
There’s a big difference between asking tricky questions and asking trick questions.
But your missing the point of why words mean what they mean... half is a .5 and two means well 2 means 2
Thought so too
Actually, by half means half of the original amount, so the correct answer can only be 14. If it had said by one half, 72 would be correct. Sometimes videos can be wrong aswell :D
You can also get 8 peices in 9th riddle by first making 4 peices (by horizontal and vertical cuts) and then arrange them in straight line and then make 4th cut which divers them equally in 8 parts..
Customer buys a house number in a hardware store. I literally died there.
House plate number bro
😂😂
Me too😂
We’re you buried or cremated?
tricky and mind blowing puzzles
Absolutely Awesome
Answer to bonus riddle : 4
Reason : as asked in question we need to tell "min. no. of balls" that need to be drawn out with a probability that they turn out to be same colored. In case if you try to draw greater than 4, in that case it will not satisfy the riddle as it is not asking for a guaranteed solution. It clearly states "drawing at random".
just about to comment this! If it did ask for a guaranteed 4 colours the the answer is 13 because 3 + 3 + 3 + 3 + 1 would get you the 4th colour
Yes it's 4.
@SCD-50 Swastik Dey Wrong. He asked what is the MINIMUM number of draws where you can get all 4 same color. Odds are unlikely but you can draw 4 balls and get all 4 the same color.
@@basedbear1605 but it is not guaranteed, so you need to draw 13 to draw 4 balls of the same colour each time
@@vasa6556 Read the question carefully. It never asked for the minimum amount to gaurantee they will be the same.
I have scored 9correct answers....... really mind blowing riddles........... great job sir
I love looking at theses comments and seeing people flex about how well they can do math yet I bet they are the kind of people that say math is useless and too hard 😂😂
I love looking at these comments and seeing people flex. (period) :P
Actually, those that flex about their math skills are more than likely the same ones that will look like a "Deer caught in the headlights" if you take away their Smartphones/calculators and have them do some basic math with just a pencil and paper.
For the bonus riddle, the answer is four balls would be the minimum that is needed to be drawn to get four of the same color. The reason is that you could theoretically be extremely lucky and get all of the first four as the same color. The probability of this event is not as high as drawing out different colored balls, but it is not zero, so it is a situation that exists and must be considered.
You must draw a minimum of 4, obviously. To ensure the result you might need to draw as many as 13. Any fewer than 13 and you could just get up to 3 of each.
In the last Bonus Riddle the solution is : minimum 13 balls to be drawn, that is N*(4-1)+1 being N the number of bags / the number of colors. In the first 4*(4-1)=12 draws I could be so unlucky to draw 3 balls of the first color + 3 balls of the second color + 3 balls of the third color + 3 balls of the fourth/last color, but with the 13th draw I will certainly have 4 balls of the same colour.
You are telling about maximum number of balls. The question is minimum, so the answer is 4.
@@sahilpatil9957 No, the question asked them to be *drawn at random*. If drawn at random, any colored ball could come out. And he could get the following sequence red, black, green, blue repeated 4 times, before he got a 4th ball of any of the 4 colors in the bag! 4 x 3 ball of each color = 12, so you should understand properly that the problem is randomness of the draw. This could be shown by writing a computer program to randomly draw balls until it got 4 of the same color. It's also algorithmically sound. It is possible that the 13th ball will have to be drawn before guaranteeing a 4th color of one of the 4 colored balls in the bag, and this is what the question was asking: how many minimum would they have to draw, in the worst case randomness scenario.
The answer is 4. It is possible to randomly draw 4 balls of the same color.
The last question is simple
The max probability of balls comming out of each colour but not fulfilling conditions is 3 so 3 * 4 =12
Now any ball of any colour would do the magic i.e 12+1=13
Correct
Dr. Goyal please can you make me understand...?
I think ans is 4...because it is trick question which is asking min number of balls to be drawn to get 4 balls of same color ...not the max no of balls which will surely gives us 4 colours of a ball.
Minimum num is surely 4
@@muhammadshoaibrajput2746 minimum number that guarantees 4 of the same colour is 13, the key word is guarantees
For number 9 you could also stack the four on top of each other, then cut down through all of them.
Bonus riddle : the answer is 4. The riddle says 'draw at random' so if you draw at random and you get the 4 blue balls straight away than it only took 4 balls. Of course the chances of that are very slim but it is possible.
Answer to last question i think is 4 bcoz maximum number will be 13 as 13th ball will surely make 4 same color balls out but minimum number should be four assuming we got the same color balls everytime....
You indeed only need 13! Worse case scenario at 12 draws is getting 4x3... inevitably the next draw will lead to four same colors. All other solutions lead to a shorter number of draws.
Wow interesting questions given to me thanks alot of you Sir
The cake riddle.
Horizontal cut, vertical cut, then take the TR and BL pieces and place one touching the BR piece curved edge to curved edge, then the other piece touching that one point to point. Then make one diagonal cut through all 4.
My first quick reading made it look too simple, so I read it again.
Important lesson.
I like ur concept,keep it up guys
And In No. 9, you could stack the four quarter pieces on top of each other, and cut the whole stack in half...😂 like if you get it
Mathemagical that’s what my answer was
The top of the cake is round if you cut PERFECTLY through horizontally the top pieces will bE bigger
@@markymark5933 not to mention there 's less frosting/icing for the ones who get the lower half layers
DaVae Her yeah but it’s a plain cake so it’s fine
To beat this CZcamsr's logic, it's actually impossible for us to cut 8 equal pieces, because anything produced by human means will have a margin if error, thus the impossibility of properly dividing the cake in 8.
Most mathematics and vector algebra and sciences were developed using weighing balance during art analysis of Michelangelo. Symbols to go with it. Frequency is usually generated at the balance centre. But the distance from the centre is what actually we call time.
Its trulyy help to think differently. Thanks dude for help❤
For the bonus riddle.
Min draw- 4 . Theres a probability to get 4 same color at the first 4 draw.
Max draw- 13.. if you draw 3 balls of each color.. 3x4(colors) =12...the next draw should be the 4th
You gotta have rnjesus on your side to draw 4 and get it. But it is possible
Bravo!
I had made out IV instead of 4😁
Me too
Me✋
Me
Same here
Very good sharp mind. gud luck
The bonus riddle is more silly than a riddle. "What is the minimum number of balls you must draw at random to get four same colored balls"? 4. Always 4. It doesn't matter how many balls of each color exist because, as written, it could always happen with just 4. But I know that's not the spirit of the question. It's an expansion on a question I actually used to ask during interviews, but the question I asked was: "There are 10 black socks and 10 white socks in a drawer. You are blindfolded. What is the minimum number of socks you must pull from the drawer to guarantee you have a matching pair?" The most common answer was 11 (wrong) the actual answer was 3. Because if you had pulled 11 socks from the drawer, you would have anywhere from 2 to 10 socks of each color, but the question was how many to guarantee a pair. The first two socks could only be either black/black, black/white, or white/white. The third sock would always result in 2 of one color and 1 of the other. This is the same thing, only you have to consider the goal of 4 and the fact that 4 different colors are involved. The highest number you can achieve without matching 4 balls is 12: 3 balls of each color. In that worst case scenario, the 13th ball is going to be the first to guarantee that you have 4 matched. I bet a lot of people actually answer 12 though, because it is 1 more than half of the total number of balls.
I´m thirty, have neither a job nor a girlfriend nor any other significant social enviroment, i got non of these riddles right and still watch the video on loop, while i´m listening to this donny darko mad world song and getting hammered at five in the morning.
Really i gotta change something x)
2:43 I thought it is birthday Candles
Same
Monster PX Pac me too. It would work. But he’s in a hardware store 😂
Same then i read he went to hardware store
Yup I solve 1st questions correctly
Last question: 4 types of balls, edging point of possibilities is 3 of each ball, which is 12 balls and one more ball would mean 13. If a ball was reached earlier it would mean less balls drawn, so maximum needed is 13. The minimum is 4. I don't know if the wording is weird but I guess the answer would be 13 according to the difficulty of reaching it.
If someone asks me facebook-style poorly-worded math problems, I can calculate my chances of walking out of the interview: 100%.
I stop watching this video after the first question 🤦♂️😂
@PJDesseyn1 although I agree with you for most of the other questions, I did see the first question in a training course I was sent on whilst working for bank. The grammar is correct as we don't usually place an indefinite article when dividing numbers. What catches people out is the preposition: divided 'by' half, not 'in' half. That door numbers one was ridiculous though because we need an 'a' or 'the' to have the question make actual sense.
13, assuming first 12 are as unlucky as possible you will have 3 of each so 13 pick will always guarantee a match of 4 balls
Pigeon-Hole Principle
If you are that unlucky you'll pick 7 reds and 6 greens, so no. Its 19 if you're that unlucky
The question doesn’t say you have to get 4 same colored balls GUARANTEED. The answer is 4, because that is the minimum number of balls you need to have a chance at 4 same colored balls. If the question had said guaranteed you would be right.
4 is the minimum to possibly draw four balls of the same color. Pick red, red, red, red. To GUARANTEE 4 of the same color, you must pick 13. The first 12 could be evenly divided as three of each color. The 13th ball would be the 4th of a single color. 13 is also the MOST you would ever have to draw to get 4 of a single color.
@@Danagon1 Well except it does. It says you must draw. That is where the guarantee comes from.
For #9 I cut in a plus sign. Then stack the pieces on top, then cut down vertically. Bam 8
Bit of a tricky question that last one - i see two answers
Minimum no of balls drawn that will have at lease a chance to be the same colour: 4 (too obvious i think)
Minimum no of balls drawn to guarantee 4 balls of the same colour: 13 (worst case scenario - 3 of each colour plus 1)
I got 10 out of 11. That's good since I miss most of the riddles (and all of TedEd's). The one I missed was the #8 and just by one move
Title- "interview riddles"
Ransom and recommendations and reservations - "we're gonna terminate this man's career"!
7:27 what if the cake was topped with a strowberry
*P L A I N C A K E*
?
then you just eat it
end of discussion
Then you would need to cut the strawberry into 8 pieces.
Then you cut vertical and then an “x” or two perfectly opposite diagonals. Like a pizza. 8 equal pieces with strawberry also cut equally in 8 pieces (if the strawberry is perfectly symmetrical).
Bonus Question: minimum number “needed” to get 4 balls of the same color is 4, as even though the odds of doing this are small, they are never zero. The minimum number guaranteed to draw 4 of the same color is 13, as even if you get one of each color 3 different times, the last one will complete a set of 4 no matter what. Then there’s the mathematical way to figure out the average number of draws it would take to obtain 4 of one color, but that’s too long to type here and I really don’t feel like doing that work right now.
The MAXIMUM (not minimum) number guaranteed to draw 4 of the same color is 13
I interpreted the first riddle as dividing 30 by half (of itself), which is 15 and getting 2. And then adding 12, which got me 14. Guess I was wrong though.......
It's called a trick question. They designed it to be misleading. It SHOULD say "by one half" if they didn't want it to be misleading.
Thank you for the video! All of you friends are super awesome!
The answer to the first problem is 14, because when one says "divide by half", it means to take the number (i.e., 30) and divide it by one-half of *itself,* not 2, and not simply one-half (which is the same as multiplying by 2).
Therefore, 30 ÷ (1/2 × 30) + 12 = 14.
Karl Scheel no nigga divide by half means 30➗0.5=60, it’s like saying divide by (number), half is a number not just a word
@@suhaibmukhlis8662 Actually not, by half per definition means half of original amount, so 14 is the correct answer. Atleast in English.
@@Bech285 no it doesn’t, by half means 30/0.5. In half means 30/2 that’s what it means in English
@@suhaibmukhlis8662 No it's not what it means in English. If you want to divide by 0.5 you should say "divide by one half" or "divide by a half". If you simply say by "half" then half of what? It is implicitly saying half of itself. Is this the English that is taught in India? In a different video there was some guy from India trying to convince people that "alphabet" can be used describe a letter when it can't, neither in the US nor UK, an alphabet is a *set* of letters, never a single letter, but apparently you can say "'I' is an alphabet" in India.
In 9th riddle, in my solution i cut the cake vertically, then kept one half of the cake above another, then i cut again into 4 parts, then keep all of them one over another, then made the final cut to give 8 equal parts. Also i think here the solution provided by u is not ok because the upper part of the cake is different... So actually u r nit able to divide equally.
10 out of 10....although I did get the same answer for the triangle one, so maybe 9.5
There is also another way to make the three squares.
13 will ensure we have 4 balls of at least one color. The rest can be 3 each.. so the combination will be 3+3+3+4
My answer on the first riddle is 14,ahahaha, but still it's worth trying😂
The solution u talk about in 10 is just the as u think for 4 th
All riddles r too easy
But really enjoyed 😀
Nice one
Bonus riddle answer-
No of different bowls * (count of bowls in minimum no color set -1) +1 = 13
Min. no of such balls could be 4
@@oliverpezelj WOW! Even by your idiotic logic(if it HAD to be THE 4 BLUE BALLS((which is NOT the case)) it could still be done with 4 draws.
Dividing "by" half is not the same as dividing "in" half.
Also it seems purposely unclear by saying "half" which is not necessarily the same as "one half"... Or maybe that's a dialect difference
He should have said divide by a half.
The statement is purposely unclear.
Seriously this one is just misleading because they didn't include the "a" in front of half.
@@derek9511 i don't know so much english this was a english problem not math 😔
In last question consider worst possible scenario where you lifted all balls in each colour leaving one ball in each colour left so the next ball you pick after must complete one set of colours.So 6+5+4+3+1.Definitely there is nothing to do with how many number of balls in each colour are present
All were AWESOME!!!!
*A fact😊*. We can write 4 by using 3 match sticks like *\lv\* {Roman numbers}
If you take away 1 from the blue set, 2 from the black set, 3 from the green set and 4 from the red set - 1+2+3+4=10. ... now you have three of each color. So no matter what color you put back in, you will have four of one color ... 4+5+6+7-10+1=13 ... so the answer is 3x4+1=13 when you reverse that order.
13 draws will guarantee a set of 4 of one color ... where 4 is the minimum possible by chance.
But the written "min. no." could be construed to mean anything ... the answer might as well me 1. At some town called random is a set of 12 balls already, so you just need to draw 1. Or it could be impossible, because he said "same colored" and that is a color other than the 4 listed ... ya never know ... nothing is consistent.
Is this your original voice??
If yes..
Then you have an awesome voice dude😍😎
Yes Chandu :) that's my normal voice . Your comment really encouraged me :)
@@LOGICALLYYOURS You are welcome dude..
good concept
#10 well then there’s three solutions; before you rotate it, so the edges are pointing up, down, left, and right, go one row above the bottom point. you can move those two down and out for another triangle
There are an infinite number of solutions-just move any 2 coins out to make a triangle with the top coin. As long as the remaining coins are inside, you have a solution.
Great🤩
13 balls are to be taken out to get 4same coloured balls, if 1st 2nd 3rd and 4th balls are red green black blue, same thing continued for the other three rounds, so total 12 balls were taken out with 3 colours each, If the 13th ball was taken out from the remaining will match with any of the previously taken balls so minimum 13balls required to get 4same colour balls
I got 72 at first place.
Answer to bonus riddle is 13. There are 4 colours balls. If you pick one from each in same order the pick for the 4th ball of same colour be 13th.