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counting and probability intermediate

Problem

Cory has apples, oranges and bananas. If Cory eats one piece of his fruit per day for a week and the pieces of fruit within each category are indistinguishable, in how many orders can Cory eat the fruit? One such order is
Solution
There are a total of fruits, so there are ways to arrange them. However, since the fruits in each category are indistinguishable, we must divide out the repeats:
Final answer
210