The factors of 7 are:
1, 7
The factors of 19 are:
1, 19
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The GCF of 7, 21, and 42 is 7, because 7 is a factor of all three.
Since 7 is a factor of 42, it is automatically the GCF.
7
the answer is 7
The GCF of 14, 21, and 42 is 7.