$\log_{10}\left(\frac{n}{n-1}\right)$ के विस्तार में $n^{-r}$ का गुणांक क्या है?

  • A
    $\frac{1}{r \log_e 10}$
  • B
    $-\frac{1}{r \log_e 10}$
  • C
    $-\frac{1}{r! \log_e 10}$
  • D
    इनमें से कोई नहीं

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