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The factors of 20 are 1, 2, 4, 5, 10, and 20.

The factors of 50 are 1, 2, 5, 10, 25, and 50.

The common factors of 20 and 50 are 1, 2, 5, and 10. Therefore, the least common factor (the smallest common factor) is 1.

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Q: What is the least common factor of 20 and 50?
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