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13 is a Prime number so its only factors are 1 and itself. Since 13 is not a factor of 28, the only common factor of 13 and 28 is 1.
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What is the greatest factor of 12 and 20?
The greatest common factor of 12 and 20 is 4
What is the greatest common factor of 20 12 and 4?
The GCF of 4, 12, and 20 is 4The GCF is: 4
What is the greatest common factor of 14 20 and 18?
The GCF is 2.
What is the greatest common factor or 20 and 12?
The GCF is 4.
What is the greatest common factor of 12 14 and 20?
The GCF is 2.
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