The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
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7, 14, 21, 28, 35
The are: 3 9 15 21 and 27
7, 14, 21, 28, 35
well five times two is ten so double five and you have the same multiples
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.