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

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    इनमें से कोई नहीं

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मान लीजिए $\sum_{n=0}^{\infty} \frac{n^3((2n)!) + (2n-1)(n!)}{(n!)((2n)!)} = ae + \frac{b}{e} + c$,जहाँ $a, b, c \in \mathbb{Z}$ और $e = \sum_{n=0}^{\infty} \frac{1}{n!}$ है। तो $a^2 - b + c$ का मान $................$ है।

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

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

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

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