420
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For 105, 84, 70, 49 the LCM is: 2,940
420
If that's really 4270 and 84, the GCF is 14 and the LCM is 25620. If that's 42, 70 and 84, the GCF is 14 and the LCM is 420.
The LCM of 12, 84 is 84.
The LCM of 63 and 84 is 252.