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