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The prime factors of 100 are 2, 2, 5, and 5.

The prime factors of 120 are 2, 2, 2, 3, and 5.

The prime factors of 180 are 2, 2, 3, 3, and 5.

The prime factors that all three numbers have in common are 2, 2, and 5. Therefore, the greatest common factor is 2 x 2 x 5 = 20.

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16y ago

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