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One method is to express each number in terms of its prime factors.

189 = 3 x 3 x 3 x 7 = 33 x 7

297 = 3 x 3 x 3 x 11 = 33 x 11

The Greatest Common Factor is 33 = 27.

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Q: What is the greatest common factor of 189 and 297?
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