$(e^x - 1)^2$ के विस्तार में $x^4$ का गुणांक क्या होगा?

  • A
    $1/12$
  • B
    $7/12$
  • C
    $5/12$
  • D
    इनमें से कोई नहीं

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$\frac{1}{1!} + \frac{4}{2!} + \frac{7}{3!} + \frac{10}{4!} + \dots \infty = $

योग $\sum \limits_{n=1}^{\infty} \frac{2n^2+3n+4}{(2n)!}$ किसके बराबर है :

$\sum_{n=1}^{\infty} \frac{2n^2+n+1}{n!}$ का मान ज्ञात कीजिए।

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

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