જો $A + B + C = {180^o},$ તો $\frac{{\tan A + \tan B + \tan C}}{{\tan A\,.\,\tan B\,.\,\tan C}} = $

  • A

    $0$

  • B

    $2$

  • C

    $1$

  • D

    $-1$

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  • [IIT 1988]

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