A box at a yard sale contains 3 different china dinner sets, each

您还没有登录，登录以后才可以查看答疑和进行提问。

试题详情

A box at a yard sale contains 3 different china dinner sets, each consisting of 5 plates. A customer will randomly select 2 plates to check for defects. What is the probability that the 2 plates selected will be from the same dinner set?

答案：A

专业教师答疑

最新

提问

2
评分

2
浏览

Problem Solving

老师这个总的可能数15*14/2！我知道，但为啥分子不是15*4呢（第一个可以选15中任意一个，但第二个只能选那一套里面其余4个了）

6
评分

6
浏览

Problem Solving

请老师讲一下

问个问题

答疑小程序

最热提问

Problem Solving
The equation of l1 is y=2x+ 6. If l2 is parallel t......
Text Completion
Her (i)_____ at office meetings was in surprising ......
Text Completion
What once seemed a quixotic vision—the “Subway......
Sentence Equivalence
Science is arguably a very high-minded pursuit, bu......
Sentence Equivalence
In order to cultivate new repertoire, the music in......
Text Completion
The limitations of human attention cause us to mis......
Text Completion
Studies of hermaphroditic plants may exhibit sampl......
Sentence Equivalence
It is troubling that blogs, which may be among the......

试题详情

专业教师答疑 最新 提问

问个问题

答疑小程序

最热提问

专业教师答疑

最新

提问