3 a 2 1 July 8, 2019 16 32 64 128 3 a 2 )= 12 3 a 2 )= 18 3 a 2 )= 15 3 a 2 )+ 1 4 3 a 2 11 3 a 2 10 A 3 2 16 A 3 2 100 A 3 2 1 8 A 3 2 1 backup strategy A 3 1 2 5 3 a's 2 b's 1 c A 3 a 2 1 0 3 a 1 2 )- 10 1 3 a 2 )= 12
