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Greatest common factor of 420 and 504 is 84.
The GCF is 140.
The greatest common factor of the numbers '420' and '2646' is '42'.
The least common multiple of 15 , 20 , 35 = 420
20=22 x544=22 x11The greatest common factor is 22 =420 = 4 x 5, 44 = 4 x 11 so HCF is 4