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The factors of 21 are 1, 3, 7, and 21.

The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.

The common factors are 1 and 3.

The greatest common factor is 3.

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Wiki User

7y ago
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Wiki User

9y ago

The common factors are: 1, 3

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Wiki User

9y ago

1 and 3

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Anonymous

Lvl 1
4y ago

1

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Q: What are the common factor of 21 and 30?
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