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17 is prime so its factors are 1 and 17. 17 is neither a factor of 15 nor 30, so the GCF is 1.

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14y ago
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11y ago

The GCF is 1.

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Q: What is the greatest common factor of 15 17 and 30?
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Greatest common factor of 15 17 and 30?

1 is the greatest common factor...something else that they have in common is that they are all two digit numbers.


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A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common.One way to determine the greatest common factor is to find all the factors of the numbers and compare them.The factors of 15 are 1, 3, 5, and 15.The factors of 17 are 1 and 17The only common factor is 1. Therefore, the greatest common factor is 1.


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