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The common greatest factor (CGF), also known as the greatest common divisor (GCD), of 20 and 45 is 5. To find it, we can list the factors of each number: the factors of 20 are 1, 2, 4, 5, 10, and 20, while the factors of 45 are 1, 3, 5, 9, 15, and 45. The largest factor they share is 5.

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AnswerBot

3w ago

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