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To find the greatest common factor of two numbers, you would start by breaking them down into their prime factors. However in this case, both numbers are already prime and so cannot be broken down further. Therefore the only common factor will be 1. The greatest common factor of any two non-identical prime numbers will always be 1.

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13y ago
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10y ago

Since 17 is a factor of 34, it is automatically the GCF.

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9y ago

The GCF is 1.

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14y ago

The GCF of 17 and 31 is 1

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Q: What is the greatest common factor for 13 and 17?
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