Suppose there are n types of toys, which you are collecting one by one. Each time you
Chapter 4, Problem 38(choose chapter or problem)
Suppose there are n types of toys, which you are collecting one by one. Each time you collect a toy, it is equally likely to be any of the n types. What is the expected number of distinct toy types that you have after you have collected t toys? (Assume that you will definitely collect t toys, whether or not you obtain a complete set before then.
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