1 has one factor: itself.
11 has two factors: one and itself.
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You are 12-20. The only common factor of 11 and 21 is 1.
The Greatest Common Factor of 3, 11 is 1.
The GCF is 1.
1 and 11
1 since the only factors of 11 are 1 and 11, and 11 isn't a factor of 36