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
2024-01-12
14
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:https://tihaiku.com/zcyy/3355155.html
相关试题推荐
Thesumofthenon-primenumbersbetween40and50,non-inclusive,isA、131B、176
Ifx,y,andwarenonzeronumbersandx-y=w,whichofthefollowingisequalto
ListA,BandCmeansthelistofmultiplesofprimenumbers2,3,and5respect
Sixdifferentnumbersaretobeselectedfromthe(0,1,2,3,4,5,6)tocompos
Thenumbers3,10,17,24,31and38arethefirstsixtermsofaninfinitesequ
Eachof5positivewholenumbersisatleast8.Theaverage(arithmeticmean)oft
Howmany3-digitnumbersbetween100and200haveadigitthatistheaverageof
Thenumbersinthelistaboveareorderedfromleasttogreatest.Ifthemedian
Inhowmanyofthewholenumbersbetween100and200doesthedigit6occurexac
KingSchoolhasanenrollmentof900students.Theschooldayconsistsof6clas
随机试题
Asfoodistothebody,soislearningtothemind.Ourbodiesgrowandmusc
[originaltext]Accordingtolatestpsychologicalresearch,appearancedoesa
抑制远曲小管和近曲小管的碳酸酐酶()A:螺内酯 B:氨苯喋啶 C:氢氯噻嗪
神经细胞兴奋后其兴奋性的规律性变化是:A.绝对不应期→相对不应期→超常期→低常
下列不具有健脾祛湿作用的药物是A、苍术 B、猪苓 C、白术 D、薏苡仁
城市燃气管网按不同的压力级制分类,分为不同级别的管网系统,以下不属于其分类的是(
苯乙烯与丁二烯反应后的产物是: A.丁苯橡胶B.聚苯乙浠C.合成纤维D.
面试热点:就业难,应该怎么办? 【热点背景】 今年全国普通高校毕业生
企业对固定资产进行更新改造时,应当将该固定资产账面价值转入在建工程,并将被替换部
高强(大于C50级)的混凝土工程,应优先选用的常用水泥是()。A.硅酸盐水
最新回复
(
0
)