Simplifique as expressões :
a) (n+3)! . (n-2)! / n! . (n-1) !
b) (n-2)! / (n-3) + (n+1)! / (n-2)!
a) (n+3)! . (n-2)! / n! . (n-1) !
b) (n-2)! / (n-3) + (n+1)! / (n-2)!
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A)b)