42, 84, 126 and so on.
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LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
Two common multiples of 21 and 15 are 105 and 315.
Common multiples include 168, 336 and 504
Multiples of 6: 12, 18, 24 Multiples of 7: 14, 21, 28
What are three common multiples of 2 6 8