作者Nocp (冲浪..被浪冲 傻傻分不清)
看板Grad-ProbAsk
标题[商管] [统计] 抽牌的机率
时间Tue Feb 2 12:13:12 2010
A card hand selected from a standard card 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 .
What is the probability that the enlarged hand contains at least three
kings?
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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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