# Finding the interval of convergence

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• March 12th 2010, 08:49 AM
posix_memalign
Finding the interval of convergence
Hi,
I'm having some trouble with the task of finding the convergence interval of the following series:

$\sum_{n=0}^\infty \frac{n^2 - n + 1}{n!}x^n$
• March 12th 2010, 08:51 AM
Krizalid
try to use the ratio test.