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Let f : N rarr N be a function such that...

Let `f : N rarr N` be a function such that `f(m + n) = f(m) + f(n)` for every m, `n in N`. If `f(6) = 18`, then `f(2).f(3)` is equal to :

A

54

B

6

C

36

D

18

Text Solution

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The correct Answer is:
A
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