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The LCM of 21 and 3 is 21.
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Find least common multiple (LCM) of: 42 & 6 63 & 9 7 & 1 105 & 15 147 & 21 42 & 3 21 & 6 63 & 3 21 & 9 105 & 3 21 & 15 147 & 3 21 & 21
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