જો $(4.2)^{x} = (0.42)^{y} = 100$ હોય,તો $\frac{1}{x} - \frac{1}{y} = $

  • A
    $1$
  • B
    $2$
  • C
    $1/2$
  • D
    $-1$

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જો $a^{2}+b^{2}=c^{2}$ હોય,તો $\frac{1}{\log _{c+a} b}+\frac{1}{\log _{c-a} b}=$

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