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The LCM of 21 and 39 is 273.
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Find least common multiple (LCM) of: 42 & 78 63 & 117 7 & 13 105 & 195 147 & 273 42 & 39 21 & 78 63 & 39 21 & 117 105 & 39 21 & 195 147 & 39 21 & 273
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