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The LCM of 21 and 27 is 189.
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Find least common multiple (LCM) of: 42 & 54 63 & 81 7 & 9 105 & 135 147 & 189 42 & 27 21 & 54 63 & 27 21 & 81 105 & 27 21 & 135 147 & 27 21 & 189
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