\[(n + 1)(n + 5) - (n - 2)(n + 2) =\]
\[= n^{2} + n + 5n + 5 - n^{2} + 4 =\]
\[= 6n + 9 = 6n + 6 + 3 = 6(n + 1) + 3.\]
\[Остаток\ равен\ 3.\]