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## Main Question or Discussion Point

Im not sure if it is related to calculus but,

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.

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.

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