【一道数学概率问题英文题目哦(a)Inthenational-查字典问答网

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　　【一道数学概率问题英文题目哦(a)Inthenationallottery,youidentify6ballsfromasetof49balls.Then6ballsareselectedatrandomfromthe49ballsandyougetaprizeifatleast3ofthesematchtheballsyouidentified.(Ignori】

　　一道数学概率问题英文题目哦

　　(a)Inthenationallottery,youidentify6ballsfromasetof49balls.Then6ballsareselectedatrandomfromthe49ballsandyougetaprizeifatleast3ofthesematchtheballsyouidentified.(Ignoringthebonusballfornow)

　　---Whatistheprobabilitythatyougetaprizeofsomesort?

　　(b)actuallyitismorecomplicated;afterthe5ballsareselectedatrandom,asixth“bonus”ballisselectedatrandomandyougetaspecialkindofprizeif,ofthesixballsyouidentified,5wereintheselectedgroupofsixandthesixthisthebonusball(aswellasalltheprizesformatching3ormoreofthefirstsixballs)

　　---Whatistheprobabilityyougetaspecialkindofprizejustdescribed?

　　---Keepingthisinmind,whatistheprobabilitythatyougetaprizeofsomesort?

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2020-12-2305:47

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　　Solution(a):Ifthisproblemneedn'tarrangeallballsinasequence.3_balls:1/184244_balls:1/2118765_balls:1/19068846_balls:1/13983816(b):Theprobabilitythatgetaspecialkindofprizeis1/44;Witho...