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b) 4
c) 2
d) 6
21:
1, 3, 7, 21
32:
1, 2, 4, 8, 17, 32
b) 4
c) 3
d) 6
D21 (1,21,3,7)
D32 (1, 32, 2, 16, 4, 8)