If each trial is independently a success with probability p, find the expected number of trials needed for there to have been both at least n successes and at least m failures. HINT: Is it useful to know the results for the first n + m trials? 想好几天了... -- 无名小站 telnet://wretch.twbbs.org Statistics (统计方法讨论区) 盈月与繁星 telnet://ms.twbbs.org Statistics (统计：让数字说话) 成大计中站 telnet://bbs.ncku.edu.tw Statistics (统计方法及学理讨论区) 交大资科次世代 telnet://bs2.twbbs.org Statistics (统计与机率) 批踢踢实业站 telnet://ptt.twbbs.org Statistics (统计学及统计软体版) --

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