JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

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Application +4 | -1

If a function

f(x)

satisfies

f(x+y)=f(x) \cdot f(y) ; \forall \, x, y \in \mathrm{N}

and

f(1)=3

and

\sum\limits_{{x=1}}^n f(x)=120

, then

n=

View answer and explanation

Correct option: A

Option A (4) is correct because it satisfies the equation derived from the given functional equation and summation.

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