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Factors of 45: 1, 3, 5, 9, 15, 45.

Factors of 55: 1, 5, 11, 55.

Factors of 20: 1, 2, 4, 5, 10, 20.

GCF (45, 55, 20) = 5

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Q: What are the greatest common factors of 45 55 and 20?
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