If ${\log _2}x + {\log _x}2 = \frac{{10}}{3} = {\log _2}y + {\log _y}2$ and $x \ne y,$ then $x + y = $

  • A

    $2$

  • B

    $65/8$

  • C

    $37/6$

  • D

    None of these

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