18
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The LCM is: 18
24
90
The common multiples of 2 and 6 are the infinite set of numbers that are multiples of their LCM, which is 6. So the common multiples of 2 and 6 are 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, and so on.
Only one can be least. That's 42. The next two are 84 and 126.