If $72^x \cdot 48^y=6^{x y}$, where $x$ and $y$ are non-zero rational numbers, then $x+y$ equals

  • [KVPY 2017]
  • A

    $3$

  • B

    $\frac{10}{3}$

  • C

    $-3$

  • D

    $-\frac{10}{3}$

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