It is: 7
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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 is 7.
The GCF of 21, 49 and 115 is 1.
7 is the greatest common factor of 4942 and 21, or of 49, 42 and 21, if that is what you meant.
The GCF is 7.