An urn contains 10 green and 20 blue balls. Balls are drawn at random, one at a time

Chapter 12, Problem 72

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An urn contains 10 green and 20 blue balls. Balls are drawn at random, one at a time, until a green ball is selected. Each ball is replaced before the next ball is drawn. Let T denote the first time until a green ball is drawn. Find E(T ) and var(T ).

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