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Questions  >>  CBSE XI  >>  Math  >>  Sequences and Series
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If $f$ is a function satisfying $f(x+y)=f(x).f(y)\:\:\forall x,y\in N$ such that $f(1)=3\:\:and\:\:\displaystyle\sum ^{n}_{x=1} f(x)=120$, then find the value of $n$.

$\begin{array}{1 1}3 \\ 4 \\ 5 \\ 6 \end{array} $

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