That's two different things. The common factors of 350 and 420 are 1, 2, 5, 7, 10, 14, 35, 70, with 70 being the GCF. The least common denominator of 350 and 420 is 2100.
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Greatest common factor of 420 and 504 is 84.
The lowest common factor is: 1
2
The GCF is 140.
The least common multiple of 15 , 20 , 35 = 420