Math----More about Probability
2011-02-06 7:36 am
Ann has 7 gold coins and 3 sliver coins.Bob has 4 gold coins and sliver coins.If they excharge one of their coins at random,find the probability that the respective number of gold coins and sliver coins with each of them remains the same
回答 (3)
2011-02-08 9:51 pm
✔ 最佳答案
P(coin)=[(7/10)x(4/12)]+[(3/10)x(8/12)]
P(worker)
={[(5x4)/(2x1)]x(1/4)x(1/4)x(1/4)x(3/4)x(3/4)}+[5x(1/4)x(1/4)x(1/4)x(1/4)x(3/4)]+[(1/4)x(1/4)x(1/4)x(1/4)x(1/4)]
2011-02-06 8:00 am
8 sliver coins,thanks
2011-02-06 7:45 am
Bob has [how many] sliver coins??
收錄日期: 2021-04-13 17:48:28
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110205000051KK01031