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Least Common Multiple (LCM) for 28 49 84 is 588
For 84, 49, 28 the LCM is: 588
The LCM is 588.
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 GCF is 7.The GCF is 7.