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Problems dealing with various probabilities, be it coin tossing or game winning.
Fred has five dice and decides to see how long it will take him to throw five 6s using the following procedure. He tosses all five dice.

He then picks up and re-tosses those that are not 6s. He repeats this process until he has all 6s.

What is the expected number of tosses to get five 6s? Give the answer exactly in terms of a fraction.

(No Solution Yet, 2 Comments) Submitted on 2025-02-05 by K Sengupta   
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