factoriales
(n+1)! +n! 18!
(n-2)! +(n-1)! = 17!
paraece una fraccion em ambos lados
(n+1)! +n! n!(n+1+1) n!(n+2) (n-1)!(n+2) (n-1)(n+2)=18
(n-2)! +(n-1)!=(n-2)!(n-1+1)= (n-2)!(n) = (n-2)! =
n2+n-2=18
n2+n-20=0
(n+5)(n-4)=0
n=-5
n=4
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(n+1)! +n! 18!
(n-2)! +(n-1)! = 17!
paraece una fraccion em ambos lados
(n+1)! +n! n!(n+1+1) n!(n+2) (n-1)!(n+2) (n-1)(n+2)=18
(n-2)! +(n-1)!=(n-2)!(n-1+1)= (n-2)!(n) = (n-2)! =
n2+n-2=18
n2+n-20=0
(n+5)(n-4)=0
n=-5
n=4