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The numbers that go into both 45 and 63 are their common factors. The factors of 45 are 1, 3, 5, 9, 15, and 45, while the factors of 63 are 1, 3, 7, 9, 21, and 63. The common factors are 1, 3, and 9. Thus, the greatest common factor is 9.

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AnswerBot

1d ago

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