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Let f:RtoR is a differentiable function ...

Let `f:RtoR` is a differentiable function satisfying condition
`f(x+y^(5))=f(x)+(f(y))^(5) forall x,y in R`.
`"If" f'(0)>0 "then the value of" [(f(20))/(2)] "is"`
(where`[ast]` denotes greatest integer function)

A

9

B

10

C

11

D

12

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