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Let f(x) be a cubic polynomical such tha...

Let `f(x)` be a cubic polynomical such that `f'(x)=0` at `x=1` and `x=3, f(1)=6,f(3)=2`, then value of `f(-1)` is

A

`10`

B

`-14`

C

`11`

D

`20`

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