N 3 2n 2 July 8, 2019 16 32 64 128 N 3 2n 2 9n 18 0 N 3 )( 2n 2 1 N 3 2n 2 36n 72 N 3 2n 2 5n 10 N 3 2n 2 4n 8 N 3 2n 2 2n 4 N 3 3n 2 2n is divisible by 6 N 3 3n 2 2n N 3 2n 1 3n 2 N 3 2n 2n 1 N 3 3n 2 2n 120 N 2 2n 3 0 Prove n 3 3n 2 2n is divisible by 6 3 2n 1 2 n 2 divisible by 7
