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If alpha,\ beta,\ gamma are the zeros of...

If `alpha,\ beta,\ gamma` are the zeros of the polynomial `f(x)=a x^3+b x^2+c x+d` , then `1/alpha+1/beta+1/gamma=` (a) ` b/d` (b) `c/d` (c) ` c/d` (d) ` c/a`

A

`-(b)/(c)`

B

`(c)/(d)`

C

`-(c)/(d)`

D

`-(c)/(a)`

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