Question

Me ajudem. Resolva a equação (n-1)!(n+2)!/n!(n+1)! = 2

Answer 1

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