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Since 55 is a factor of 110, it is automatically the GCF.
The greatest common factor of 165 and 345 is 15.
The greatest common factor of 55 (5 x 11) and 105 (3 x 5 x 7) is 5.
The factors of 143 are:1, 11, 13, 143The factors of 220 are:1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220The common factors are:1, 11Therefore, the Greatest Common Factor (GCF) is: 11
Since 22 is a factor of 110, it is automatically the GCF of this problem.