That depends on the numerical value of Y.
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
The first three multiples of 9 are 9, 18 and 27. For them to be common, they need to be compared to another set of factors.
If that's 9, 14 and 21, the first three common multiples are 126, 252 and 378.
9, 18, 27
9, 18, 27
The first three are 9, 18, and 27.
18,36,and 54
They are: 3, 6 and 9
63
They are the first three multiples of their lowest common multiple: 36, 72, 108.
You can't have common multiples if they have nothing to be in common with however the first 3 multiples of 9 are 9,18 and 27 Think of just your times tables when finding out Multiples to find the first 5 multiples just count by 9's until you have said 5 numbers and Bingo
72, 144, 216