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If a,b,c,d, x are real and the roots of ...

If a,b,c,d, x are real and the roots of equation `(a^2+b^2+c^2)x^2-2(ab+bc+cd)x+(b^2+c^2+d^2)=0` are real and equal then a,b,c,d are in (A) A.P (B) G.P. (C) H.P. (D) none of these

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