Question

Помогите упростить факториал
(1/n!)-(1/(n+1)!)

Answer 1

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