Misc Ex Ch 9 XI Q7 If f is a function satisfying f(x+y)=f(x)f(y) for all x,y∈N such that f(1)=3 ,

In this video I am going to explain Misc exercise chapter 9 question 7.
If f is a function satisfying f(x+y)=f(x)f(y) for all x,y∈N such that f(1)=3 and
x=1 to n
∑ f(x)=120,find the value of n ?
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Minakshi Porwal (9460189461)