$\frac{1}{2} + \frac{1}{4} + \frac{1}{8 \times 2!} + \frac{1}{16 \times 3!} + \frac{1}{32 \times 4!} + \dots \infty = $

  • A
    $e$
  • B
    $\sqrt{e}$
  • C
    $\frac{\sqrt{e}}{2}$
  • D
    इनमें से कोई नहीं

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$1 + \frac{{\log_e x}}{{1!}} + \frac{{(\log_e x)^2}}{{2!}} + \frac{{(\log_e x)^3}}{{3!}} + \dots \infty = $

$\frac{1-2x}{e^x}$ में $x^n$ का गुणांक क्या है?

$\frac{2}{1!} + \frac{4}{3!} + \frac{6}{5!} + \frac{8}{7!} + \dots \infty = $

$1+\frac{1+2}{2 !}+\frac{1+2+2^2}{3 !}+\ldots$ का मान ज्ञात कीजिए।

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