5 1 2 b 6 )= 4 July 8, 2019 16 32 64 128 A 1 2 3 5 b 4 6 9 49b 1 5 * b1 1 b 2 6 A 1 2 3 4 5 b 6 7 8 9 A 1 3 5 99 b 2 4 6 100 A (- 2 1 b 6 5 c 4 k Let a 1 2 3 5 b 4 6 9 A 4 2 b 6 5 c 1 4 Cho a 1 3 5 b 2 4 6