यदि $\log \left(\frac{x+y}{5}\right) = \frac{1}{2}(\log x + \log y)$ है,तो $\frac{x}{y} + \frac{y}{x} = $

  • A
    $20$
  • B
    $23$
  • C
    $22$
  • D
    $21$

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