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Thread: Sum of Factorial

  1. January 4th 2011, 11:51 AM #1
    Wurz
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    Question Sum of Factorial

    need to find the sum of (1/n!)
    from n= 1 to infinity
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  2. January 4th 2011, 11:55 AM #2
    snowtea
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    \sum_{n=1}^\infty \frac{1}{n!} = \sum_{n=1}^\infty \frac{1^n}{n!} = (\sum_{n=0}^\infty \frac{1^n}{n!}) - 1 = e^1 - 1 = e - 1
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  3. January 4th 2011, 12:10 PM #3
    Wurz
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    thank alout
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