We have given, $a_1$ = - 1 , $a_n$ = $\frac{a_n-1}{n}$ , n ≥ 2 $a_1$ = - 1 , $a_2$ = $\frac{a_1}{2}$ = $-\frac{1}{2}$ , $a_3$ = $\frac{a_2}{3}$ = $\frac{-\frac{1}{2}}{3}$ = $-\frac{1}{6}$ $a_4$ = $\frac{a_3}{4}$ = $\frac{-\frac{1}{6}}{4}$ = $-\frac{1}{24}$ , $a_5$ = $\frac{a_4}{5}$ = $\frac{-\frac{1}{24}}{5}$ = $-\frac{1}{120}$ Hence the first five terms of the given sequence are – 1, – 1/2, – 1/6, –1/24, –1/120. The corresponding series is - 1 + $\left(-\frac{1}{2}\right)+\left(-\frac{1}{6}\right)$ + $\left(-\frac{1}{24}\right)+\left(-\frac{1}{120}\right)$ + ...