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To find the greatest common factor of two numbers, you first need to factorise those numbers. In this case:

72=3x3x2x2x2

91=7x13

The next step would be to find any common factors. As there are none, this means that the greatest common factor of 72 and 91 is 1.

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Q: What is the greatest common factor of 72 and 91?
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