1.There are 10 prizes , where 1of them is a doll, 2 of them are chocolate ,3 of them are colour pencils and 4 of them are storybooks. If Macy chooses 2 prizes together at random ,how much higher is the probability of getting a storybook than that of not getting a storybook?
可否比個steps我啊!!因為我唔識!!thx
probability(maths)
2008-01-27 4:29 am
回答 (2)
2008-01-27 4:48 am
✔ 最佳答案
P(抽到storybook)=4/10x3/9+4/10x6/9+6/10x4/9=2/3
P(抽不到storybook)=1-2/3
=1/3
ans=2/3-1/3
=1/3
參考: myself
2008-01-27 4:42 am
sorry a，i really don't know how to show you the steps .but i know the answer(just my answer)-----36%:30%,i don't know whether i am wrong or not.
參考: myself
收錄日期: 2021-04-16 22:34:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080126000051KK03326