The remainder when 82n−622n+1is divided by 9 is
82n−622n+1
=(9−1)2n−(63−1)2n+1= 2nC092n−2nC192n−1+2nC292n−2−⋯− 2nC2n−1(9)+2nC2n− 2n+1C0632n+1−2n+1C1632n+2n+1C2632n−1−⋯−+2n+1C1(63)−2n+1C0
=9m+1+1=9m+2 for some integer m
Thus, when 32n−622n+1
is divided by, 9 the remainder is 2.