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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)^nf(x)=120`, then the value of n is

A

4

B

5

C

6

D

none of these

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The correct Answer is:
A
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PATHFINDER-PROGRESSION AND SERIES -QUESTION BANK
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