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The factors of 21 are: 1, 3, 7, and 21. The factor pairs of 21 are (1, 21) and (3, 7).
`1.3,7.21

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6y ago
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10y ago

It is: 3*7 = 21

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6y ago

They are: 1, 3, 7 and 21

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Q: What are the factors of 21?
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