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

If `alpha, beta, gamma` are roots of the equation `x^(3) + px^(2) + qx + r = 0`, then `(alpha + beta) (beta + gamma)(gamma + alpha)` =

A

`p-qr`

B

`r-pq`

C

`q-rp`

D

`r+pq`

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The correct Answer is:
B
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