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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 30 are 2, 3, and 5.

The prime factors 1224 are 2, 2, 2, 3, 3, and 17.

The prime factors in common are 2 and 3, so the greatest common factor is 2 x 3 = 6.

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Q: What is the greatest common factor of 30 and 1224?
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