If $a, b, c$ are in $G.P.$,then the equations $ax^2 + 2bx + c = 0$ and $dx^2 + 2ex + f = 0$ have a common root if $\frac{d}{a}, \frac{e}{b}, \frac{f}{c}$ are in

  • A
    $A.P.$
  • B
    $G.P.$
  • C
    $H.P.$
  • D
    None of these

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