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common divisor is 3 and 1

6 divided by 3 = 2

6 divided by 1 = 6

15 divided by 3 = 5

15 divided by 1 = 15

21 divided by 3 = 7

21 divided by 1 = 21

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Q: What is the greatest common divisor of 6 15 and 21?
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