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If f(x) is a function satisfying f(x+y) ...

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_(x=1)^(n) f(x) = 120`
Then the value of n is `:`

A

4

B

5

C

6

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
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