A 4 6 8 July 8, 2019 16 32 64 128 A 6 4 8 9 A 2 4 6 8 10 A 2 4 6 8 A = 2 4 6 8 9 A 0 2 4 6 8 3 a 4 8 6 A 4 6 A 4 8 6 + 4 = 4