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Let `f:RtoR` be differentiable at x=0. if f(0)=0 and f'(0)=2 , then the value of `lim_(xtox)(1)/(x)[f(x)+f(2x)+f(3x)+......+f(2015x)]` is

A

2015

B

0 (zero)

C

`2015xx2016`

D

`2015xx2014`

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