1,A couple wants to tour four cities in Europe(London,Hamburg,Paris,and Zurich)on their honeymoon.If an irinerary is the order in which these cities will be visited,how many itineraries are possible?
2,How many ways can a committee of twenty people elect a president,secretary,and a treasurer?
人气：495 ℃ 时间：2020-05-10 15:27:46
解答
1,4*3*2*1=24
2,20*19*18=自己算一下吧
推荐
- Translate into an algebraic expression
- 英语翻译
- On a map whose scale is 1:50000 ,a wood is represented by a region of area 6 平方厘米.State the corresponding area on a map
- Given the 100 students in the Springdale High School senior class,38 students are taking math,45 students are taking psy
- What is the order of operations with real numbers and variables?
- 雷锋说:“人的生命是有限的,可是为人民服务是无限的,我要把有限的生命投入到无限的为人民服务之中去的理解
- 1.一个瓶子的质量是0.2kg,装满水时,总质量为700g.求
- 等式两边同时微分,为什么相等,而两边求导,为什么大多数不等?
猜你喜欢
