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If zeros of the polynomial f(x)=x^3-3p x...

If zeros of the polynomial `f(x)=x^3-3p x^2+q x-r` are in A.P., then (a) `2p^3=p q-r` (b) `2p^3=p q+r` (c) `p^3=p q-r` (d) None of these

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