$\frac{1}{1 \cdot 3} + \frac{1}{2} \cdot \frac{1}{3 \cdot 5} + \frac{1}{3} \cdot \frac{1}{5 \cdot 7} + \dots \infty = $

  • A
    $2 \log_e 2 - 1$
  • B
    $\log_e 2 - 1$
  • C
    $\log_e 2$
  • D
    इनमें से कोई नहीं

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$\log_e(1 + 3x + 2x^2)$ के विस्तार में $x^n$ का गुणांक क्या है?

$\frac{4}{1 \times 3} - \frac{6}{2 \times 4} + \frac{12}{5 \times 7} - \frac{14}{6 \times 8} + \dots \infty = $

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