Question 610242
simplify the the expression completely (n!n^2-n!)/((n-1)(n+1)) 
I tried to simplify it, and all I could get was n(n-2)!n^2-n(n+2)!
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(n!n^2-n!)/((n-1)(n+1))
= n!*(n^2-1)/(n^2-1)
= n!