The greatest common factor of 7, 35 and 49 is 7.
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The GCF is 7.
The least common factor of any set of integers is 1.
You must have at least two whole numbers to determine a greatest common factor.
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.
The GCF of 21, 49 and 115 is 1.