A b c 5 July 8, 2019 16 32 64 128 A b c 5 formula A b c 5 4 3 A b c 5 7 A b 5 c 12 A b c d 5 A b c 2 3 5 A b c 4 5 6 A 1 b 5 c 4 If a b c 5