21, 42, 63.
21,42 and 63 are the first three multiples
21
The first 3 multiples of 7 are: 7, 14, and 21.
4200, 8400, 12600.
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.
The first 3 multiples of 7 are: 7, 14, and 21.The first 3 multiples of 14 are: 14, 28, and 42.
3,6,9,12,15,18,21,24
7, 14, 21
The first 3 multiples are: 7, 14 and 21
7, 14, 21
2
The first 2 multiples are 42,84.