Counting Permutations When Indistinguishable Objects May Exist. How many rows , each one consisting of 3 A’s 1 B, and 4 C’s are there? (Here are some such rows: BACCCAAC ABCACACC CCCCAAAB Etc.) Answer: (3+1+4)! / (3!1!4!). In general:

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Counting Permutations When Indistinguishable Objects May Exist

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