श्रेणी $\frac{1^2}{1 \cdot 2!} + \frac{1^2 + 2^2}{2 \cdot 3!} + \frac{1^2 + 2^2 + 3^2}{3 \cdot 4!} + \dots + \frac{1^2 + 2^2 + \dots + n^2}{n(n + 1)!} + \dots \infty$ का योग किसके बराबर है?

  • A
    $e^2$
  • B
    $\frac{1}{2}(e + e^{-1})^2$
  • C
    $\frac{3e - 1}{6}$
  • D
    $\frac{4e + 1}{6}$

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