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The greatest common factor is 3:

Factors of 9: 1, 3, 9

Factors of 18: 1, 2, 3, 6, 9, 18

Factors of 21: 1, 3, 7, 21

The two common factors are 1 and 3 and the greatest of these two is 3.

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โˆ™ 2011-10-26 18:32:09
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Q: What is the greatest common factor of 9and18 and 21?
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