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Anonymous
They are 70, 140 and 210.
Wiki User
If that's 9, 14 and 21, the first three common multiples are 126, 252 and 378.
14, 28, 42.
14, 28 and 42
7, 14, 21
14, 28, 42
42, 84, 126
14, 28, and 42
70, 140, 210 and so on.