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  1. M

    Power series

    It's part of a birth rate for a birth and death process in a particular special case. The series looks like it should be summable but I can't think how to do it.
  2. M

    Power series

    I'm trying to find the sum of the following series and am a bit stuck: sum_{r=0}^{+\infty}1/(r*r!) It looks a bit like e^1 but the extra r in the denominator is causing problems. Can anyone help?
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