If ${a^2}, {b^2}, {c^2}$ are in $A.P.$,then $\frac{a}{b + c}, \frac{b}{c + a}, \frac{c}{a + b}$ will be in

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

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