What is a common factor of 42 and 54

- What is the greatest common factor of 42 and 54
- What is the highest common factor of 42 and 54
- What is the least common factor of 42 and 54
- What is the greatest common factor of 42 54 and 72
- What is the greatest common factor of 42 54 and 96
- What is the greatest common factor gcf of 42 and 54
- What is the greatest common factor between 42 and 54
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