It is 1 because 7 and 19 are prime numbers
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The GCF 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.
It is 7
7
The factors of 5 are 1 and 5. The factors of 7 are 1 and 7. The factors of 10 are 1,2,5 and 10. So the highest common factor is 1.