A. 1,2,4,8,9,10,11,12,1,2,4,6,7,8,9 B. 1,2,3,4, 5,6,7,8,9,10,11,12,13,14,15 C. 1,2,4,8,16,1,2,4,6,8,9,10,11,12,6 D. 1,2,4,8,16,17,18,19,20,10,11,12,13,14,15
A. 5 B. 6 C. 7 D. 8
A. 31 B. 42 C. 21 D. 13