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

  • A
    $e$
  • B
    $3e$
  • C
    $e/2$
  • D
    $3e/2$

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