Since the list of numbers is infinite, there is no such thing as the Greatest Common Multiple.
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the LCM of 12 and 28 is 84
A common multiple of 12,15, and 28 is 420. (15 multipled by 28 equals 420 and 12 multipled by 35 equals 420)
The least common multiple of 12 and 28 is 72. 12:12,24,36,48,60,72 18:18,36,54,72
There is no "greatest common multiple" for any pair of numbers. If you meant greatest common factor, the answer is 3.
3