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The LCM of 6 and 21 is 42.
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Find least common multiple (LCM) of: 12 & 42 18 & 63 2 & 7 30 & 105 42 & 147 12 & 21 6 & 42 18 & 21 6 & 63 30 & 21 6 & 105 42 & 21 6 & 147
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