The least common multiple is 72. Now 72 x 2 is also a common multiple as is 72x 3,4,5 etc.
So we have 72, 144, 216, 288, etc.
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The first 3 common multiples of 4 and 12 are: 12, 24, 36
72, 144, 216 and so on.
Since the LCM is 12 then the common multiples are multiples of 12 12, 24, 36, 48
12, 24, 36 and so on.
12, 24, 36