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It is unusual to ask for a least common factor because it is always 1.

The factors of 210 are 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, and 210.

The factors of 350 are 1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 175, and 350.

The common factors are 1, 2, 5, 7, 10, 14, 35, and 70.

Thus, the least common factor is 1.

However, the least common prime factor is 2.

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Q: What is the least common factor of 210 and 350?
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