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For the LCM of a set of numbers, write each number as a product of its prime factors in index form. Then, taking each prime in turn, find the highest index with which it appears in any of the numbers' representation. Finally, multiply these together.
So, for example, suppose you have 10, 16, 24 and 36
10 = 2*5
16 = 24
24 = 23*3
36 = 22*32
The highest power of the primes are 24, 32 and 5. Multiply these together to give 720 as the LCM.
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