72, 144, 216 and so on.
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First 3 multiples of: 3: 3, 6, 9 8: 8, 16, 24 9: 9, 18, 27 72, 144, 216
The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.
234567
They are the multiples of 3*8 = 24
The multiples of 9 are: 1 and 9 3 and 3