Let $A, B$ and $C$ are the angles of a plain triangle and $\tan \frac{A}{2} = \frac{1}{3},\,\,\tan \frac{B}{2} = \frac{2}{3}$. Then $\tan \frac{C}{2}$ is equal to

  • A

    $7/9$

  • B

    $2/9$

  • C

    $1/3$

  • D

    $2/3$

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