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The GCF of 7, 21 and 35 is 7. This leaves you with 1, 3 and 5 respectively, You can go no further as the only common factor remaining is 1.

The factors of 7 are: 1, 7

The factors of 21 are: 1, 3, 7, 21

The factors of 35 are: 1, 5, 7, 35

The common factors are: 1, 7

The Greatest Common Factor (GCF) is: 7

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9y ago

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