一道数学概率问题 英文题目哦
题目
一道数学概率问题 英文题目哦
(a) In the national lottery, you identify 6 balls from a set of 49 balls. Then 6 balls are selected at random from the 49 balls and you get a prize if at least 3 of these match the balls you identified. (Ignoring the bonus ball for now)
---What is the probability that you get a prize of some sort?
(b) actually it is more complicated; after the 5 balls are selected at random, a sixth “bonus” ball is selected at random and you get a special kind of prize if, of the six balls you identified, 5 were in the selected group of six and the sixth is the bonus ball (as well as all the prizes for matching 3 or more of the first six balls)
---What is the probability you get a special kind of prize just described?
---Keeping this in mind, what is the probability that you get a prize of some sort?
答案
Solution(a):If this problem needn't arrange all balls in a sequence.3_balls:1/184244_balls:1/2118765_balls:1/19068846_balls:1/13983816(b):The probability that get a special kind of prize is 1/44;Witho...
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
- 有关物理圆周运动中的皮带转动问题
- 用手表示数字六,七,八,九,十怎么表示
- 在方程2x^2+3x=1中,b^2-4ac的值为——————
- 如果2分之1小于m分之8,m分之8小于5分之4,那么m可取自然数是多少?
- 描写泉水的词
- --- you have love,you have got everything
- 速度和加速度的定义运用什么物理方法
- 兴之所至,心之所安;尽其在我,顺其自然.
- 英语翻译
- 用山青水秀造句.
热门考点
- 一只装有水的长方体玻璃杯,底面积是60平方厘米,水深8厘米.现将一个底面积是12平方厘米的圆柱体铁块竖放在水中后,仍有一部分铁块露在水面上,现在水深多少厘米?
- 《祖国,我终于回来了》的读后感
- 用72厘米的铁丝做一个长方体的框架,长,宽,高的比是3:2:1,这个长方体的面积是( )平方厘米.
- I hope I can get together with my parents改为同义句
- He goes to school ﹙ ﹚his school clothes every day A.in B.with C.wears D.put on
- 语文试卷上的题目……我不会改了,帮帮忙
- 问各位几个近义词,回荡 纯洁 灌溉 赞美
- 已知sina=五分之根号五 ,则 sin4a-cos4a的值为
- ( )I hope you can be better.
- 河面上有一层厚厚的冰用英语怎么说?