問題詳情
23. (5%) Recently, Larry taught his daughter Emily how to play a game. To encourageEmily to practice this game, Larry decides to play with her until she wins two of therecent three games. Assume that either of the two players wins and the game cannothave a tie. If the probability that Emily a game is 1/4 independently of allpreceding and future games, find the expected number of games to be played.
(A) 121/9
(B) 130/11
(C) 203/16
(D)89/7
(E) 55/4
參考答案
答案：D
難度：計算中-1
書單：沒有書單，新增