[數學]機會率問題
2011-09-25 6:33 pm
Suppose that we have 2 urns: Urn 1 contains 4 red and 5 green balls, while Urn 2 contains 3 red and 2 green balls.
We randomly select a ball from Urn 1 and swap it with a random ball from Urn 2. Then a ball is selected at random from Urn 2.
Find the probability that this ball is red.
回答 (1)
2011-09-25 8:10 pm
收錄日期: 2021-04-23 23:26:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110925000051KK00205