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The GCF is 3.

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Q: What are the greatest common factor of 9 and 15?
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What is the greatest common factor of 15 9 18?

What is the greatest common factor of 9, 18, and 15.The answer is....3


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The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.


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