If \[f(x)\] is a function satisfying \[f(x+y)=f(x)f(y)\] for all \[x,\ – McqOptions

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1.	If \[f(x)\] is a function satisfying \[f(x+y)=f(x)f(y)\] for all \[x,\ y\in N\] such that \[f(1)=3\] and \[\sum\limits_{x=1}^{n}{f(x)=120}\]. Then the value of \[n\] is [IIT 1992]
A.	4
B.	5
C.	6
D.	None of these
Answer» B. 5

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