G9.3 If $c=1996 \times 19971997-1995 \times 19961996$, find the value of $c$.
$\begin{aligned} c & =1996 \times 1997 \times 1001-1995 \times 1996 \times 1001=1001 \times 1996 \times(1997-1995) \\ & =3992 \times 1001=39923992\end{aligned}$