作者a016258 (上善若水)
看板Grad-ProbAsk
标题Re: [商管] [统计] 抽牌的机率
时间Tue Feb 2 14:50:48 2010
※ 引述《Nocp (冲浪..被浪冲 傻傻分不清)》之铭言：
: A card hand selected from a deck consists of 2 kings ,2 queens and a jack.
: Three additional cards are selected at random and without replacement
: from the remaining cards in the deck .
不是吧@@"
应该是 三张牌从剩下的47张牌抽出
: What is the probability that the enlarged hand contains at least three
: kings?
所以 现在手上的八张牌 有至少三张king 的机率~
吧??
: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
: 由题目知 每抽到一张牌 丢 3张同样回去, 可是不重复所以要扣一张走 = 丢两张回去
: 请问 可以这样分析?!
: 1 - P (每次都没抽到 K )
: 3 5 7
: = 1 - ( --- + --- +--- ............)
: 5 7 9
: 那接下来该怎办...!?
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.112.111.208
1F：推 Nocp:A card hand selected from a standard card deck 前面少打 02/02 15:06
2F：推 Nocp:所以意思是 这人有5张牌 还要再抽3张?! 02/02 15:08