A bag contains 3 white balls(W)and 7 black balls(B).Known that the probability of getting a white ball is 3/10(3over10).
Q:If a black ball is drawn without replacement,what is the probability of getting another black ball from the bag?
Ans:2/3(2over3)
STEPS please!!!
急急急急急急急急急Maths....10pts
2006-11-23 3:01 am
回答 (1)
2006-11-23 3:11 am
✔ 最佳答案
P(getting another black ball from the bag) = 7-1 / 3 + 7-1= 6 / 9
= 2/3
由於本人是用中文學習數學的，所以英文表達上可以會出錯，
敬請原諒。但大概方法是這樣做。
參考: 自己
收錄日期: 2021-04-13 18:30:57
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061122000051KK03088