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Proper factors do not include one and the number itself.
Factors of 9 include 1, 3, and 9. Factors of 15 include 1, 3, 5, and 15. Factors common to both 9 and 15 are 1 and 3.
The factors of 33 include 1,3,11,33The factors of 55 include 1,5,11,55The factors of 77 include 1,7,11,77Therefore the greatest common factor of 33, 55 and 77 is 11.
Common factors for 56 and 84 include 1, 2, 4, 7, 14 and 28.
Common factors include 1, 3 and 9.