Sum of Factorial

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Jan 4th 2011, 11:51 AM
Wurz

Sum of Factorial

need to find the sum of (1/n!)
from n= 1 to infinity
Jan 4th 2011, 11:55 AM
snowtea

$\sum_{n=1}^\infty \frac{1}{n!} = \sum_{n=1}^\infty \frac{1^n}{n!} = (\sum_{n=0}^\infty \frac{1^n}{n!}) - 1 = e^1 - 1 = e - 1$
Jan 4th 2011, 12:10 PM
Wurz

thank alout

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