作者GBRS (书中自有颜如玉)
看板trans_math
标题[考古]93年中原应数
时间Fri Jun 17 17:05:15 2005
An urn contains 10 red and 10 white balls. The balls are drawn from the urn at
random , one at a time .
Find the probability that the four white balls in the six-balls drawn
if the sample is done (a)with replacement (b)without replacement.
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1F：推 ArgoNautyoyo:题目看不太懂 (泣) 61.231.144.105 06/17
2F：推 beatitude:replacement = 拿走不放回 应该吧...218.167.173.126 06/17