Since the lowest common multiple of 3 and 5 is 15, the common multiples of 3 and 5 are the multiples of 15: 30, 45, 60, 75, 90, etc...
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They are multiples of 60.
What are three common multiples of 2 6 8
The first three common multiples of 8 and 12 are 24, 48, and 72.
15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.
There are not just three common multiples, but infinitely many. They are 168 and it multiples, so 1680 and 16800.