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Here are the greatest common factors of the pairs of numbers including 72:

GCF of 1, 72 is 1

GCF of 2, 72 is 2

GCF of 3, 72 is 3

GCF of 4, 72 is 4

GCF of 5, 72 is 1

GCF of 6, 72 is 6

GCF of 7, 72 is 1

GCF of 8, 72 is 8

GCF of 9, 72 is 9

GCF of 10, 72 is 2

GCF of 11, 72 is 1

GCF of 12, 72 is 12

GCF of 13, 72 is 1

GCF of 14, 72 is 2

GCF of 15, 72 is 3

GCF of 16, 72 is 8

GCF of 17, 72 is 1

GCF of 18, 72 is 18

GCF of 19, 72 is 1

GCF of 20, 72 is 4

GCF of 21, 72 is 3

GCF of 22, 72 is 2

GCF of 23, 72 is 1

GCF of 24, 72 is 24

GCF of 25, 72 is 1

GCF of 26, 72 is 2

GCF of 27, 72 is 9

GCF of 28, 72 is 4

GCF of 29, 72 is 1

GCF of 30, 72 is 6

GCF of 31, 72 is 1

GCF of 32, 72 is 8

GCF of 33, 72 is 3

GCF of 34, 72 is 2

GCF of 35, 72 is 1

GCF of 36, 72 is 36

GCF of 37, 72 is 1

GCF of 38, 72 is 2

GCF of 39, 72 is 3

GCF of 40, 72 is 8

GCF of 41, 72 is 1

GCF of 42, 72 is 6

GCF of 43, 72 is 1

GCF of 44, 72 is 4

GCF of 45, 72 is 9

GCF of 46, 72 is 2

GCF of 47, 72 is 1

GCF of 48, 72 is 24

GCF of 49, 72 is 1

GCF of 50, 72 is 2

GCF of 51, 72 is 3

GCF of 52, 72 is 4

GCF of 53, 72 is 1

GCF of 54, 72 is 18

GCF of 55, 72 is 1

GCF of 56, 72 is 8

GCF of 57, 72 is 3

GCF of 58, 72 is 2

GCF of 59, 72 is 1

GCF of 60, 72 is 12

GCF of 61, 72 is 1

GCF of 63, 72 is 9

GCF of 64, 72 is 8

GCF of 65, 72 is 1

GCF of 66, 72 is 6

GCF of 67, 72 is 1

GCF of 68, 72 is 4

GCF of 69, 72 is 3

GCF of 70, 72 is 2

GCF of 71, 72 is 1

There are 24 with the greatest common factor of 1.

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Q: How many positive integers less than 72 have the property that the greatest common factor of the number and 72 is equal to 1?
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