Suppose $m, n$ are positive integers such that $6^m+2^{m+n} \cdot 3^w+2^n=332$. The value of the expression $m^2+m n+n^2$ is

  • [KVPY 2010]
  • A

    $7$

  • B

    $13$

  • C

    $19$

  • D

    $21$

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