The GCF is 3.
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The prime factors of 600 are 2, 2, 2, 3, 5, and 5. The prime factors of 1350 are 2, 3, 3, 3, 5, and 5. The prime factors they have in common are 2, 3, 5, and 5, so the greatest common factor is 2 x 3 x 5 x 5 = 150.
The greatest common factor of 30 and 39 is 3.
The greatest common factor of 24 and 57 is 3.
The greatest common factor of 3 and 57 is 3
The Greatest Common Factor (GCF) is: 3