What is the difference between greatest common divisor and greatest common denominator ?

The greatest common factor (GCF) of a set of numbers is the largest factor that all the numbers share. For example, 12, 20, and 24 have two common factors: 2 and 4. The largest is 4, so we say that the GCF of 12, 20, and 24 is 4. GCF is often used to find common denominators

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Step-by-step explanation:

Rule is that you just have to match up the corrisponding numbers and exponents to make the right expression. Hope i'm right.