14
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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.
Least Common Multiple (LCM) for 28 49 84 is 588
The Least Common Multiple (LCM) for 28 49 and 84 is 588.The Greatest Common Factor (GCF) for 28 49 and 84 is 7.
Gcf: 42 lcm: 252
The LCM is 154.