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The factors of 5 are 1 and 5.

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

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

The common factors are 1 and 5. Therefore, the least (smallest) common factor is 1.

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Q: What is the least common factor of 5 10 and 20?
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