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You might list the prime factors for each number, then gather all the prime factors that appear in one or more of the numbers. Example: LCM of 2, 3, 4, 5, 6
2 = 2
3 = 3
4 = 2x2
5 = 5
6 = 2x3
The factor 2 has to be included twice (since it appears twice as a factor in 4), so the LCM is 2x2x3x5 = 60.
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