Question: Problem 3.39 An urn contains two white balls and four red balls. Balls are drawn one by one without replacement until two white balls have

Problem 3.39 An urn contains two white balls and four red balls. Balls are drawn one by one without replacement until two white balls have appeared. Denote by U the number of balls that must be drawn until both white balls have appeared. Compute the pf of U.

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