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

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

A

`2(p^(2) - 3q)`

B

r - pq

C

`q^(2) - 2pr`

D

`(p^(2) - 2q)/(r^(2))`

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1

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