12, 18, 24.
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multiples of 3 ... 21, 24, 27, 30 (between means leave out 30 multiples of 6 ... 24, 30 so the answer is 24
Multiples of 6 are 6, 12, 18, 24, 30, 36... Multiples of 10 are 10, 20, 30, 40... The LCM of 6 and 10 is 30. The greatest common multiple could go into infinity.
30, 60 and 90 are all multiples of 6 and 10
The are: 6, 12, 18, 24.
30, 60, 90, 120...etc.