Suppose $a, b, c$ are positive integers such that $2^a+4^b+8^c=328$. Then, $\frac{a+2 b+3 c}{a b c}$ is equal to

  • [KVPY 2015]
  • A

    $\frac{1}{2}$

  • B

    $\frac{5}{8}$

  • C

    $\frac{17}{24}$

  • D

    $\frac{5}{6}$

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