If ${a^{x - 1}} = bc,{b^{y - 1}} = ca,{c^{z - 1}} = ab,$then $\sum {(1/x) = } $

  • A

    $1$

  • B

    $0$

  • C

    $abc$

  • D

    None of these

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  • [KVPY 2012]

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