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Math Help - Sum of Factorial

  1. #1
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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. #2
    Senior Member
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    Dec 2010
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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. #3
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    thank alout
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