$\frac{2}{1} \cdot \frac{1}{3} + \frac{3}{2} \cdot \frac{1}{9} + \frac{4}{3} \cdot \frac{1}{27} + \frac{5}{4} \cdot \frac{1}{81} + \dots \infty = $

  • A
    $\frac{1}{2} - \log_e \frac{2}{3}$
  • B
    $-\log_e \frac{2}{3}$
  • C
    $\frac{1}{2} + \log_e \left( \frac{2}{3} \right)$
  • D
    इनमें से कोई नहीं

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$\frac{1}{2 \cdot 3} + \frac{1}{4 \cdot 5} + \frac{1}{6 \cdot 7} + \frac{1}{8 \cdot 9} + \dots$ का मान ज्ञात कीजिए।

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