The greatest common factor of 10 and 20 is

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Solution

The correct option is A 10
The factors of 10: 1, 2, 5, and 10
The factors of 4 are : 1, 2, 4, 5, 10, and 20

From the above, the common factors are 1, 2, 5, and 10
So, the greatest factor among the common factors is 10.

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