If $a, b, c$ are in $A.P.$,then $10^{ax + 10}, 10^{bx + 10}, 10^{cx + 10}$ will be in

  • A
    $A.P.$
  • B
    $G.P.$ only when $x > 0$
  • C
    $G.P.$ for all values of $x$
  • D
    $G.P.$ for $x < 0$

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