题库搜索>问题求解PS-12234
A jar contains 16 marbles, of which 4 are red, 3 are blue, and the rest are yellow. If 2 marbles are to be selected at random from the jar, one at a time without being replaced, what is the probability that the first marble selected will be red and the second marble selected will be blue?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
第一个选红的概率是4/16,第二个选蓝的概率是3/(16-1),两个概率之乘积即为题目所问的概率大小=(4/16)*(3/15)=1/20
440741oibgq
第二次取出的分母应该是 15，而不是12
0
0
回复
2020-09-17 07:50:02
Cancys
不放回的有序概率问题
0
0
回复
2019-07-11 16:27:34
shneggenhua
有序的排列组合：
A（4,1）*A(3,1)/A(2,16)=4!/3 * 3!/2! / (16!/14!)=1/20
无序的排列组合是C的
0
0
回复
2019-04-12 13:53:06
默默
两个同时发生时间的概率相乘
0
0
回复
2018-05-16 07:33:00
科目：
问题求解PS
来源：
GWD
题目信息2m14s
平均耗时
84.4%
平均正确率
该题由网友bL9gJ9b提供
点击上传问题求解PS -17904
The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that indudes a tax,...
问题求解PS -17748
The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that indudes a tax,...
问题求解PS -17543
There are 8 balls in a box. 2 of them are red, 4 of them are white, 2 two of them are blue. If 2 balls are to be simultaneously and randomly selected, what is the probability that they will both be red?
问题求解PS -17536
Select 4 people from 3 boys and 3 girls. What is the probability of two boys and two girls being selected?
问题求解PS -17498
Sixty percent of the members of a study group are women, and 45 percent of those women are lawyers. If one member of the study group is to be selected at random, what is the probability that the member selected is a woman lawyer?
问题求解PS -17904
The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that indudes a tax,...
问题求解PS -17748
The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that indudes a tax,...
问题求解PS -17543
There are 8 balls in a box. 2 of them are red, 4 of them are white, 2 two of them are blue. If 2 balls are to be simultaneously and randomly selected, what is the probability that they will both be red?
问题求解PS -17536
Select 4 people from 3 boys and 3 girls. What is the probability of two boys and two girls being selected?
问题求解PS -17498
Sixty percent of the members of a study group are women, and 45 percent of those women are lawyers. If one member of the study group is to be selected at random, what is the probability that the member selected is a woman lawyer?
分享
周末、晚班滚动开班 
24+35+35+6课时 
