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The greatest common factor can be calculated by identifying the common prime factors and multiplying them together.

The prime factors of 138 are 2, 3, and 23.

The prime factors of 322 are 2, 7, and 23.

The prime factors in common are 2 and 23, so the greatest common factor is 2 x 23 = 46.

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Q: What is the greatest common factor of 138 and 322?
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