$1 + \frac{1}{3!} + \frac{1}{5!} + \frac{1}{7!} + \dots \infty = $

  • A
    $e^{-1}$
  • B
    $e$
  • C
    $\frac{e + e^{-1}}{2}$
  • D
    $\frac{e - e^{-1}}{2}$

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