14, 28, 42
14, 28, 42
They are: 14, 28 and 42
lcm(2, 7) = 14 → first 3 common multiples are: 14, 28, 42; lcm(2, 8) = 8 → first 3 common multiples are: 8, 16, 24; lcm(7, 8) = 56 → first 3 common multiples are: 56, 112, 168; lcm(2, 7, 8) = 56 → first 3 common multiples are: 56, 112, 168.
7, 14, 21
There are not just three common multiples, but infinitely many. They are 168 and it multiples, so 1680 and 16800.
The common multiples of 2 and 7 are 14, 28, 42, 56, 70, 84, 98, and so on.
1,6,7 check
21
35, 70, 105
112, 224, 336
63