In a bag,there are 3 black balls and 2 white balls. One ball is drawn at random and then replaced.in three successive draws,what is the chance that only white balls are drawn.
點解ans係54/125???
2/5x2/5x2/5=8/125
有咩唔岩??
MATH........急
2007-11-21 6:23 am
回答 (2)
2007-11-21 6:49 am
✔ 最佳答案
岩,冇錯p(only white balls)=2/5x2/5x2/5
=8/125
收錄日期: 2021-04-29 20:04:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071120000051KK04050