The least common factor is a term often mistakenly given to either the greatest common factor (GCF) or the least common multiple (LCM). This term is not often used because it does not describe a useful relationship between numbers. Since 1 evenly divides all integers, 1 is technically the least common factor for any set of integers.
The smallest non-one common factor of 14, 21, and 28 is 7.
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The Greatest Common Factor of 14 and 21 is 7.
The least common factor is: 1
7.
As 4 & 21 have no factors in common, gcf=1
21=3x714=2x77 is the greatest common factor