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A differentiable function f:RtoR such th...

A differentiable function `f:RtoR` such that `f(x)=x^(3)+x^(2)f'(1)+xf''(2)+f'''(3)`, then value of `f'(1)+f''(2)+f'''(3)` is greater than

A

`1`

B

`2`

C

`3`

D

`4`

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