જો $x, y, z$ એ $A.P.$ માં હોય અને $\tan ^{-1} x, \tan ^{-1} y, \tan ^{-1} z$ પણ $A.P.$ માં હોય,તો

  • A
    $x=y=z$
  • B
    $2x=3y=6z$
  • C
    $6x=3y=2z$
  • D
    $6x=4y=3z$

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