If $x, y, z$ are in A.P. and ${\tan ^{ - 1}}x,{\tan ^{ - 1}}y$ and ${\tan ^{ - 1}}z$ are also in A.P., then :

Question

$x=y=z$

$2x=3y=6z$

$6x=3y=2z$

$6x=4y=3z$

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