You are 12-20.
The only common factor of 11 and 21 is 1.
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The GCF/HCF of 11 and 21 is 1.
21 and 80's highest common factor is one.
1 has one factor: itself.11 has two factors: one and itself.
It is: 11
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.