99, 198, 297 and so on.
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The common multiples of 3, 5, 7, 9, and 11 are the numbers that are divisible by all of these numbers. The least common multiple (LCM) of these numbers is 10395. Therefore, any multiple of 10395 is a common multiple of 3, 5, 7, 9, and 11.
Any multiple of 9 is a common multiple of 3 and 9.
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.
They are the first three multiples of their lowest common multiple: 36, 72, 108.
The lowest common multiple is 36