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The LCM of 420 and 2160 is 15120.
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Find least common multiple (LCM) of: 840 & 4320 210 & 1080 1260 & 6480 140 & 720 84 & 432 840 & 2160 420 & 4320 1260 & 2160 420 & 6480 2100 & 2160 2940 & 2160
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