Question 2
Find the value of $$\begin{aligned}&\left(\frac 12+\frac 13+\frac 14+\cdots+\frac 1{2018}\right)\left(1+\frac 12+\frac 13+\frac 14+\cdots+\frac 1{2017}\right)\\&-\left(1+\frac 12+\frac 13+\frac 14+\cdots+\frac 1{2018}\right)\left(\frac 12+\frac 13+\frac 14+\cdots+\frac 1{2017}\right).\end{aligned}$$