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Let f:{1,2,3,4} to {1,2,3,4,5,6} , then ...

Let `f:{1,2,3,4} to {1,2,3,4,5,6}` , then number of functions for which `f(1)+f(2)=f(3)` is :

A

108

B

90

C

15

D

18

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