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" If roots of the equation "x^(3)-px^(2)...

" If roots of the equation "x^(3)-px^(2)+qx-r=0" be in G.P.,then "

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If the roots of the equation x^(3) - px^(2) + qx - r = 0 are in A.P., then prove that, 2p^3 −9pq+27r=0

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