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The LCM of 21 and 4 is 84.
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Find least common multiple (LCM) of: 42 & 8 63 & 12 105 & 20 147 & 28 42 & 4 21 & 8 63 & 4 21 & 12 105 & 4 21 & 20 147 & 4 21 & 28
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