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# What is the g. c. f. of fifteen?

**1 Answer**

The GCF of 15 and 20 is 5. To calculate the GCF (Greatest Common Factor) of 15 and 20, we need to factor each number (factors of 15 = 1, 3, 5, 15; factors of 20 = 1, 2, 4, 5, 10, 20) and choose the greatest factor that exactly divides both 15 and 20, i.e., 5.

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