What is the greatest common factor of 42 A to the 5th power b cubed , 35 A cubed b to the 4th power , and 42 A b to the 4th power ?

The greatest common factor of the coefficients 42, 35, and 42 is 7. For each variable, use the smallest exponent appearing in all three terms: A has a smallest exponent of 1, and b has a smallest exponent of 3. Therefore, the GCF is 7Ab³, which is choice C.

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