首页
登录
职称英语
78:S = {1,3,5,7, …,397,399}Set S consists of the odd numbers from 1 to 399, inc
78:S = {1,3,5,7, …,397,399}Set S consists of the odd numbers from 1 to 399, inc
游客
2025-02-23
38
管理
问题
78:S = {1,3,5,7, …,397,399}
Set S consists of the odd numbers from 1 to 399, inclusive. How many different ordered points(p,t) can be formed, where p and t are numbers in S and p<t? (Note:The sum of the integers from 1 to n, inclusive, is given by the formula n(n+1)/2 for all positive integers n.)
选项
A、19,900
B、20,000
C、49,500
D、79,600
E、79,800
答案
A
解析
本题可使用枚举法答题。
199+198+197+…+1=199×(199+1)/2=19,900个可能的组合。故答案为A。
转载请注明原文地址:http://tihaiku.com/zcyy/3969717.html
相关试题推荐
78:S={1,3,5,7,…,397,399}SetSconsistsoftheoddnumbersfrom1to399,inc
Fivenumbers{1,2,3,4,5}aregoingtoarrangedinarow,iftheoddnumberscannot
Ifxandyaredifferentprimenumbers,eachgreaterthan2,whichofthefollow
Therearefivenumbersinalist,thefirstnumberislessthan4,thesecondnu
WhichofthefollowingnumbersisNOTthesumofthreeconsecutiveoddintegers?
QuantityA:thestandarddeviationoftheoddnumbersbetween1and19inclusive
Forallrealnumbersx,theoperationx*isdefinedbytheequationx*=x+4,If(
ListA,BandCmeansthelistofmultiplesofprimenumbers2,3,and5respect
Thenumbers3,10,17,24,31and38arethefirstsixtermsofaninfinitesequ
Eachof5positivewholenumbersisatleast8.Theaverage(arithmeticmean)oft
随机试题
Itiscrucial______allemployeescomplywiththedresscodetocreateaunified,
TheMexicansettlersbuiltcitiesandmissionsinwhat______becomeCalifornia.A、
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybewalking,
下列关于项目债务资金的说法,正确的有()。A.资金在使用上具有时间性限制,到期必
测定自由门静脉压(FPP)是诊断门静脉高压症最可靠的方法,其临床意义值是A.3.
所谓“独阴不生,独阳不长,说明阴阳之间的何种关系A.阴阳对立制约 B.阴阳互根
风湿热患儿,无心脏受累,其恢复到正常活动量一般需要A.1个月 B.2~3周
在急性胰腺炎发作后血淀粉酶达到高峰的时间通常是()。A.2~3h B.4~6
由于设计变更导致分部分项工程量清单缺项,新增分部分项工程量清单项目后,引起措施项
当年国债还本付息额占当年财政收入的比率称为财政偿债率。()
最新回复
(
0
)