If $\frac{a + bx}{a - bx} = \frac{b + cx}{b - cx} = \frac{c + dx}{c - dx}, (x \ne 0)$,then $a, b, c, d$ are in

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

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