If for all \x, \y \in \N, there exists a function \f(\x) satisfying \f(\x+\y)=\f(\x) \cdot \f(\y) such that \f(1)=3 and \sum_{\x=1}^{\n} \f(\x)=120, then value of \n will be

CGPET 2015 Solved Paper

Section: Mathematics

Question : 134 of 150

Marks: +1, -0

If for all x,y∈N, there exists a function f(x) satisfying f(x+y)=f(x)⋅f(y) such that f(1)=3 and

∑

x=1

f(x)=120, then value of n will be

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