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Mike was asked to make his popular ten-layer dip for the tailgate party at the big football game. The ten layers are: three layers of mashed avocado, two layers of cheddar cheese, and one layer each of refried beans, sour cream, sliced olives, chopped tomatoes, and green onions. How many ways can Mike make the ten layers in a glass serving pan?  

This is permutation with some of the items to be arranged occurring multiple times, like an anagram.

ways to layer the dip