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The LCM of 21 and 57 is 399.
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Find least common multiple (LCM) of: 42 & 114 63 & 171 7 & 19 105 & 285 147 & 399 42 & 57 21 & 114 63 & 57 21 & 171 105 & 57 21 & 285 147 & 57 21 & 399
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