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The first term of a G.P. is 1. The sum of the third and fifth terms is 90. Find the common
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- čas přidán 21. 06. 2018
- This is the Solution of Question From RD SHARMA book of CLASS 11 CHAPTER SEQUENCES AND SERIES This Question is also available in R S AGGARWAL book of CLASS 11 You can Find Solution of All Question From RD SHARMA and R S AGGARWAL book from class 6-12 on our app DOUBTNUT for Free
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==== QUESTION TEXT ====
The first term of a G.P. is 1. The sum of the third and fifth terms is 90. Find the common ratio of the G.P.
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Sir I did not understand why did we let r2=a? And it is given that a=1, then according to you, r2 is also equal to 1??
The thing is here we can substitute r2 as any variable for example, r2=x or r2=a so the equation will stand as x2+x-90=0 and then we have to just factorise it
Thanks😊😊😊😊
Question : sir at what situations do we equate any equation to zero just like you did in this problem?
Sir ye question mujhe bohot complicated lagra tha 😶...
Lekin apke explain se sab clear hai sir😊
Thankyou sir
thank you very much sir. i looked at various places but finally understood the question from here. step by step explanation is very helpful.pls keep it up.
You are most welcome