Problem #108

Repeated Appereance
Public 08/01/13 12xp Probability 63.2%

by sinan

How many times must a die with 6 faces be thrown, on average, until one face appears 4 times?

For example, one set of throws might be 1,2,1,4,3,5,2,4,6,1,3,1.

Submit your answer as a/b, where a and b are two relatively prime, positive integers.

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