Question

Simplifique as equaçoes:
a)   n!
   (n-1)
b) n!(+1)
      n! 
c)(n+2)
   (n-1)

Answer 1

a)
$\frac{n!}{(n-1)!}=\frac{n(n-1)!}{(n-1)!}=n$

b)
$\frac{n!(+1)}{n!}=1$

c)
$\frac{(n+2)!}{(n-1)!}=\frac{(n+2)(n+1)n(n-1)!}{(n-1)!}=(n+2)(n+1)n$