# What is the greatest common factor of 10 and 13? Why? The greatest common factor is 1 because 13 is a prime number. The greatest common factor is 3 because 13−10=3. The greatest common factor is 3 because 3+10=13. The greatest common factor is 23 because 10+13=23.

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Your answer is A, since 13 is a prime number.

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