First compare the coefficients 3, 6, and 3. They have the common factor 3 and this is the greatest common factor (gcf) for them. Then look at the letters in the expressions 3c^2de^2, 6cde^2, and 3de^2. c is not present in in the third term, so it will not be present in the gcf. The smallest power of d for these three terms is d (or d^1) and the smallest power of e is the second one, e^2. We write the gcf as 3de^2.