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Its factors are: 1 3 7 and 21

Note that 3 and 7 are prime numbers

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Wiki User

11y ago

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More answers

15

3,5

21

3,7

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Wiki User

12y ago
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21---> 7*3

3*7 is the answer

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Wiki User

14y ago
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The factors of 21: 1, 3, 7, 21

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Wiki User

12y ago
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3*7

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Wiki User

14y ago
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7 is not a factor of 21

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Anonymous

4y ago
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Q: What numbers would be in a factor tree for 21?
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