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When finding the GCF of a set of numbers, firstly express each number as a product of its prime factors.

117 = 3 x 3 x 13

195 = 3 x 5 x 13

The factors that each number have in common are 3 and 13.

The Greatest Common Factor is therefore 3 x 13 = 39.

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Q: What is the GCF of 117 and 195?
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