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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