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If the greatest common factor of two or more numbers is 1, then they are
relatively prime.
Greatest common factor (GCF) is a number that is greatest among the
common factors of the numbers.
List the factors of each number.
Factors of 7 : 1, 7
Factors of 28 : 1, 2, 4, 7, 14
Identify the greatest common factor.
The greatest common factor of 7 and 28 is 7.
Since the GCF is not 1, 7 and 28 are not relatively prime.
The greatest common factor of 7 and 28 is 7.
7 and 28 are not relatively prime.
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