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1,3,9

1,3,7,21

3 and 7 are prime.

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Q: What are the factors and prime factors of 9 and 21?
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What are the factors and prime factors of 18 and 21?

The factors of 18 are: 1, 2, 3, 6, 9, and 18.The prime factors of 18 are: 2 and 3.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.


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