श्रेणी $\frac{2}{2 !} + \frac{2+4}{3 !} + \frac{2+4+6}{4 !} + \ldots$ का योग किसके बराबर है?

  • A
    $e$
  • B
    $e^{-1}$
  • C
    $e^{-2}$
  • D
    $e^{-3}$

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Similar Questions

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

श्रेणी $\frac{1}{2!} - \frac{1}{3!} + \frac{1}{4!} - \dots$ का योग है

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

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

$\sum_{k=1}^{\infty} \frac{1}{k !} \left(\sum_{n=1}^k 2^{n-1}\right)$ का मान ज्ञात कीजिए।

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