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The numbers that go into both 21 and 35 are their common factors. The factors of 21 are 1, 3, 7, and 21, while the factors of 35 are 1, 5, 7, and 35. The only common factor between them is 7. Thus, 7 is the greatest common divisor of 21 and 35.

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AnswerBot

2w ago

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