1.

If alpha, beta, gamma are roots of x^(3) - px^(2) + qx - r = 0then (alpha + beta)^(-1) + (beta + gamma)^(-1) + (gamma + alpha)^(-1) =

Answer»

<P>`(q^(2) - 2pr)/(r^(2))`
`(p^(2) + q)/(PQ - r)`
`(p^(2) - 2Q)/(r^(2))`
none

Answer :2


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