$\frac{e^2 + 1}{2e} = $

  • A
    $1 + \frac{2}{2!} + \frac{2^2}{3!} + \frac{2^3}{4!} + \dots \infty $
  • B
    $1 + \frac{1}{2!} + \frac{1}{4!} + \frac{1}{6!} + \dots \infty $
  • C
    $\frac{1}{2}\left( 1 + \frac{1}{2!} + \frac{1}{4!} + \dots \infty \right)$
  • D
    $\frac{1}{2}\left( 1 + \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \dots \infty \right)$

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मान लीजिए $S_{n} = 1 \cdot (n-1) + 2 \cdot (n-2) + 3 \cdot (n-3) + \dots + (n-1) \cdot 1$,$n \geq 4$ के लिए। योग $\sum_{n=4}^{\infty} \left( \frac{2 S_{n}}{n!} - \frac{1}{(n-2)!} \right)$ किसके बराबर है?

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