The value of ${\log _3}\,4{\log _4}\,5{\log _5}\,6{\log _6}\,7{\log _7}\,8{\log _8}\,9$ is

  • [IIT 2000]
  • A

    $1$

  • B

    $2$

  • C

    $3$

  • D

    $4$

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  • [IIT 1990]

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