If A = {3, 6, 9, 12, 15, 18, 21 ) B= {4,8 12, 16,20 ) C=(2,4, 6, 8, 10, 12, 14, 16 ) and D=(5,10,15,20 ) find (1)A-B (2) A -C (3) A-D (4) B-D (5) B-C (6) D-B (7) D-A (8) C-B ?
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