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Let f(x) be 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 vlaue 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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MODERN PUBLICATION-SEQUENCES AND SERIES -MCQ ( Level-II)
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