Im not sure if it is related to calculus but,(adsbygoogle = window.adsbygoogle || []).push({});

Calculate the sum

[tex]\sum^{\infty}_{n=0}\frac{(n-1)(n+1)}{n!}[/tex]

exactly.

I tried to to partial fraction decomposition but couldn't find anything.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Sum calculation

**Physics Forums | Science Articles, Homework Help, Discussion**