$2 \ln x - \ln(x + 1) - \ln(x - 1)$ के विस्तार में,$x^{-4}$ का गुणांक क्या है?

  • A
    $0.5$
  • B
    $-1$
  • C
    $1$
  • D
    इनमें से कोई नहीं

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श्रेणी का योग ज्ञात कीजिए: $\log_e \frac{4}{5} + \frac{1}{4} - \frac{1}{2} \left( \frac{1}{4} \right)^2 + \frac{1}{3} \left( \frac{1}{4} \right)^3 - \dots$

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