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Let alpha,beta,gamma be the roots of f(x...

Let `alpha,beta,gamma` be the roots of f(x)=0, where `f(x)=x^3+x^2-5x-1`. Then `[alpha]+[beta]+[gamma]` is, where [.] is greatest integer function

A

1

B

-2

C

4

D

-3

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D
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