(a) 6, 12, 18, 24, 30, 36, 42, 48,. 54, 60. (b) 7, 14, 21, 28, 35, 42, 49, 56,. 63, 70. (c) 8, 16, 24, 32, 40, 48, 56,. 64, 72, 80. (d) 10, 20, 30, 40, 60, ...
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