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Let alpha,beta be the roots of the quadr...

Let `alpha,beta` be the roots of the quadratic equation `a x^2+b x+c=0and Delta =b^2-4ac cdotIfalpha+beta,alpha^2+beta^2,alpha^3+beta^3` are in G.P. Then a.`Delta!=0` b. `bDelta=0` c. `cDelta =0` d. `Delta =0`

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