Let a,b and c be the roots of x ^(3) -x+...

Let a,b and c be the roots of `x ^(3) -x+1 =0,` then the ralue of `((1)/(a+1)+(1)/(b+1)+(1)/(c+1))` equals to :

A

1

B

`-1`

C

2

D

`-2`

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The correct Answer is:

D

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