\frac{{h^{n + 1} }}{{n + 1}}n! = \frac{{\left( {1 - 0} \right)^{n + 1} }}{{\left( {n + 1} \right)n^{n + 1} }}n! = \frac{1}{{\left( {n + 1} \right)}}\frac{{n!}}{{n^{n + 1} }}