The GCF is 2^3 x 5.
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The GCF is 1.
You can get hte greatest common factor of three numbers by the same method you use for two numbers: splitting each number into prime factors and taking all common factors. Or, if you want to use Euclid's algorithm: gcf(25, 5, 11) = gcf(gcf(25, 5), 11)). In other words, you can take the greatest common factor of any two numbers, then the greatest common factor of the result and the third number.
23 + 29 - 25 = 52 - 25 = 27
The GCF is 4.
The GCF is 52.