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Answer: 39

Definition: A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that the numbers have in common.

Method:

One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.

The factors of 117 are 1, 3, 9, 13, 39, and 117.

The factors of 195 are 1, 3, 5, 13, 15, 39, 65, and 195.

The common factors are 1, 3, 13, and 39. Therefore, the greatest common factor is 39.

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Q: What is the greatest common factor of 117 and 195?
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