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If alpha,beta and gamma are the roots of...

If` alpha,beta` and` gamma` are the roots of the cubic equation `3x^(3)+2x^(2)+x-1=0` ,then the value of `(alpha beta+beta gamma+gamma alpha)` is (A) 3 (B) 2 (C) `(1)/(2)` (D) `(1)/(3)`

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