यदि $y = 1 + \frac{x}{1!} + \frac{x^2}{2!} + \frac{x^3}{3!} + \dots \infty$ है,तो $x = $

  • A
    $\log_e y$
  • B
    $\log_e \frac{1}{y}$
  • C
    $e^y$
  • D
    $e^{-y}$

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Similar Questions

$\sum_{r=2}^{\infty} \frac{1+2+\dots+(r-1)}{r !}$ का मान ज्ञात कीजिए:

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

श्रेणी $1+\frac{1+3}{2!}+\frac{1+3+5}{3!}+\frac{1+3+5+7}{4!}+\ldots$ के $\infty$ पदों तक का योग किसके बराबर है ($e$ में)?

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

यदि $2 \sinh x = \cosh x$ है,तो $x =$

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