If that's 9, 14 and 21, the first three common multiples are 126, 252 and 378.
63, 126, 189
126, 252, 378
63, 126, 189
The first three multiples of 3 are 3, 6, 9 The first three multiples of 9 are 9, 18, 27 As the lowest common multiples of 3 and 9 is 9, the common multiples of 3 and 9 are the multiples of 9, thus: The first three common multiples of 3 and 9 are 9, 18, 27
They are the first three multiples of LCM(5, 9), that is, the first three multiples of 45.
126, 252, 378 and so on.
LCM(9, 21) = 63 so the numbers are 63, 63*2 and 63*3.
3, 6, 9, 12, 15, 18, 21, 24.
3,6,9,12,15,18,21,24,27,30 and so on but these are the first ten multiples of three
3, 6, 9, 12, 15, 18, 21.
They are: 63, 126.