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42=2x3x7 56=2^3x7 72=2^3x3^2 so the GCF is 2 since we have a 2,3, and 7 in the first number and a 2 and a 7 in the second and a 2 and a 3 in the third. The common factors are (is) 2 The GCF is 2 Doctor Chuck

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Q: What is the greatest common factor of 42 56 and 72?
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