Question: 1. (6 points) What is the probability that a randomly generated string of length 9 using only the numbers {17 2? 3, 4} will contain

 1. (6 points) What is the probability that a randomly generated

1. (6 points) What is the probability that a randomly generated string of length 9 using only the numbers {17 2? 3, 4} will contain every number at least once? (Hint: Denote A:- to be the event that the nnmberi is missing. What's the desired event in terms of these Ai 's? )

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