If $a^2, b^2, c^2$ are in $A.P.$,then $(b + c)^{-1}, (c + a)^{-1}$ and $(a + b)^{-1}$ will be in

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

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