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22 = 2 x 11, 42 = 2 x 3 x 7, 51 = 3 x 17.

So start with 22, then multiply factors that are not present, so the 2 is already present, and we have LCM of 22 and 42 = 2 x 11 x 3 x 7. Then with 51, the 3 is already present, so the answer is 2 x 11 x 3 x 7 x 17 = 7854

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Q: What is the LCM of 22 42 and 51?
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