1,2,3 and 6
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The factors of 18 are:1, 2, 3, 6, 9, 18The factors of 20 are:1, 2, 4, 5, 10, 20The common factors are: 1, 2The Greatest Common Factor (GCF) is: 2
The lowest common factor of any set of integers is 1.
1200 +180 =1380
The LCM is: 90
The common factors are: 1, 2