If $x, y$ are real numbers such that $3^{(x / y)+1}-3^{(x / y)-1}=24$ then the value of $(x+y) /(x-y)$ is

  • [KVPY 2010]
  • A

    $0$

  • B

    $1$

  • C

    $2$

  • D

    $3$

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