Simplifying Factorials

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How would I go about simplifying something like:
(n+3)!/(n+1)! ?
 

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  • #2
[tex]\frac{(n+3)!}{(n+1)!} = \frac{(n+3)(n+2)\cdot(n+1)!}{(n+1)!}=(n+2)(n+3) = n^2 + 5n + 6[/tex]

cookiemonster
 

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