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August 11th, 2013, 02:29 PM   #1
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Evaluating a series with factorial

Here is the question:

Evaluate sigma notation (from k=0 to infinity) (1/((e^k)(k!)))

Thank you very much!
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August 11th, 2013, 03:21 PM   #2
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Re: Evaluating a series with factorial

Using the Maclaurin series:

We then see that:

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