જો $y = \frac{1}{a^{1-\log _{a} x}}$,$z = \frac{1}{a^{1-\log _{a} y}}$ અને $x = a^{k}$ હોય,તો $k =$

  • A
    $\frac{1}{a^{1-\log _{a} z}}$
  • B
    $\frac{1}{1-\log _{a} z}$
  • C
    $\frac{1}{1+\log _{z} a}$
  • D
    $\frac{1}{1-\log _{z} a}$

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જો $\frac{\log x}{l+m-2n} = \frac{\log y}{m+n-2l} = \frac{\log z}{n+l-2m}$ હોય,તો $x^2 y^2 z^2$ ની કિંમત શોધો.

$2 \log _{3} 7 - 7 \log _{3} 2$ ની કિંમત શોધો.

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