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Anonymous
LCM of 12 and 21 is 84, which is also a multiple of 28 so 84 is your answer.
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LCM(21, 28, 42) = 84
The LCM is 84.
The LCM is: 252
The LCM is: 672
3: 3 28: 7, 2, 2 21: 7, 3 LCM = 3x7x4 = 84