Posted by Bob on Sunday, September 19, 2010 at 8:21pm.
Group every 6 terms (1 cycle) together and consider as an aggregate term for a new series, ΣQn. Assume that all the terms are positive because of the n! in the denominator.
If you can prove that
Qn+1/Qn < 1, then
by the ratio test, the (new) series is absolutely convergent.
Can you take it from here?
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