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The LCM of 21 and 1680 is 1680.
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Find least common multiple (LCM) of: 42 & 3360 63 & 5040 7 & 560 105 & 8400 3 & 240 42 & 1680 21 & 3360 63 & 1680 21 & 5040 105 & 1680 21 & 8400 147 & 1680
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