16. 1, 2 , 4, 8
17. 1, 2, 5, 10
18. 1, 2, 4, 8
19. 1, 2, 3, 6
20. 1, 2
Yan po answer (^^)
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Answers & Comments
16. 1, 2 , 4, 8
17. 1, 2, 5, 10
18. 1, 2, 4, 8
19. 1, 2, 3, 6
20. 1, 2
Yan po answer (^^)