The least common factor of any set of positive integers is 1.
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The greatest common factor of 7, 35 and 49 is 7.
The factors of 21 and 1,3,7, and 21Now since 21 is not a factor of 49, but 7 is we can say right away the GCF is 7.
Common factors of 49 and 14 are: 1 and 7.
You must have at least two whole numbers to determine a greatest common factor.
The GCF is 7.