It is 7!
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∙ 9y agoLCM(21, 49, 56) = 1176
1 and 7
1 and 7
Any multiple of 1176
1 and 7
14, 21, 28, 35, 42, 49, 56, 63 . . .
Multiples 21: 1,3,7,21Multiples 49: 1,7,49
21, 28, 35, 42, 49, 56.
7, 14, 21, 28, 35, 42, 49, 56, 63etc.
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
The first 10 multiples of 7 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, and 70.
7, 14, 21, 28, 35, 42, 49, 56, 63