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To find the LCM, express the numbers in their prime factors using power notation and multiply together the highest power of each prime that is found among the factorisations:

12 = 22 x 31

42 = 21 x 31 x 71

75 = 31 x 52

LCM = 22 x 31 x 52 x 71

= 4 x 3 x 25 x 7

= 2100

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Q: What is the L C M of 12 42 75?
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