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f:RrarrR,f(x)=x^(3)+x^(2)f'(1)+xf''(2)+f...

`f:RrarrR,f(x)=x^(3)+x^(2)f'(1)+xf''(2)+f'''(3)" for all "x in R.`
The value of `f'(1)+f''(2)+f'''(3)` is

A

`1`

B

`2`

C

`3`

D

`4`

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