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3 ...

18 ÷ 3 = 6

21 ÷ 3 = 7

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Wiki User

11y ago
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Wiki User

7y ago

The only common factor is one.

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Wiki User

7y ago

The common factors are: 1, 3

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Wiki User

7y ago

Three: 1, 7, 49.

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Wiki User

7y ago

1, 7, 49.

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