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If a , b , c are in GP, then the equatio...

If `a , b , c` are in GP, then the equations `a x^2+2b x+c=0` and `dx^2+2e x+f=0` have a common root, if, `d/a , e/b ,f/c` are (1985, 2M) AP (b) GP (c) HP (D) None of these

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