If $\frac{{x + y}}{2},\;y,\;\frac{{y + z}}{2}$ are in $H.P.$, then $x,\;y,\;z$ are in

  • A

    $A.P.$

  • B

    $G.P.$

  • C

    $H.P.$

  • D

    None of these

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$0.\mathop {423}\limits^{\,\,\,\,\, \bullet \, \bullet \,}  = $

  • [IIT 1973]