The common multiples of 6 and 9 are the infinite set of multiples of their LCM, which is 18. So the common multiples of 6 and 9 are 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, and so on.
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The first 6 multiples of 6 are: 6, 12, 18, 24, 30, and 36.
The first 6 multiples of 9 are: 9, 18, 27, 36, 45, and 54.
The first 5 multiples of 3 are as follows: 3, 6, 9, 12, 15
6,12,18
3, 6, 9, 12, 15 The mean is 9.
the first 6 multiples of 6 are: 6, 12, 18, 24, 30, and 36
The first two multiples are 9 and 8.