What number is a common factor of 21 and 49

- What is a common factor of 21 and 49
- Greatest common factor for 21 and 49
- What is the highest common factor of 21 and 49
- What is the number of common factor of 21 49 and 91
- Write a number that is a common factor of 21 and 49
- What is the common factor of 21 49 and 91
- What is the least common factor of 21 and 49
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