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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28 = 2 * 2 * 7 = 22 * 742 = 2 * 3 * 7LCM = 22 * 3 * 7 = 84The LCM of 28 and 42 is 84...84
The two numbers are prime so their LCM is their product, which is 51.
The LCM is 42.
The LCM is: 42
The LCM is 1806.