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The LCM of 21 and 84 is 84.
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Find least common multiple (LCM) of: 42 & 168 63 & 252 7 & 28 105 & 420 147 & 588 3 & 12 42 & 84 21 & 168 63 & 84 21 & 252 105 & 84 21 & 420 147 & 84 21 & 588
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