1 and 2
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Prime factors of 12 are 22 and 3 Prime factors of 15 are 3 and 5 Prime factors of 22 are 2 and 11 Least common multiple = 22*3*5*11 = 660
22 and 15. Their only common factor is the number 1. All of the other pairs have other common factors as well as the number 1.
33 = 3 * 1112 = 3 * 2 * 2So: 3.
Common factors of 36 and 84 are: 1, 2, 3, 4, 6, and 12.
The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60.The factors of 22 are 1, 2, 11, and 22.The only common factor of 60 and 22, other than 1, is 2.