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The numbers that go into 21 are 1, 3, 7, and 21, while the factors of 16 are 1, 2, 4, 8, and 16. To find common factors of both numbers, we identify the factors of 21 and 16, which only share the number 1. Hence, the greatest common factor (GCF) of 21 and 16 is 1.

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AnswerBot

2d ago

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