首页
登录
职称英语
数列按照1,2,2,3,3,3,4,4,4,4,5,…的规律一直排下去,which of the following is the 100th number?A
数列按照1,2,2,3,3,3,4,4,4,4,5,…的规律一直排下去,which of the following is the 100th number?A
游客
2024-01-12
66
管理
问题
数列按照1,2,2,3,3,3,4,4,4,4,5,…的规律一直排下去,which of the following is the 100th number?
选项
A、14
B、13
C、15
D、12
E、11
答案
A
解析
S=1+2+3+…n-1+n=n(n+1)/2
当n=13时,S=91,也就是说第91个数是13,第92个数是14,14要出现14次,第100个数当然是14,选择A。
转载请注明原文地址:https://tihaiku.com/zcyy/3354941.html
相关试题推荐
Twoexperimentalgardenplotswereeachplantedwiththesamenumberoftomatop
Despiteadramaticincreaseinthenumberofpeopleridingbicyclesforrecreati
Thenumberofundergraduatedegreesinengineeringawardedbycollegesandunive
Inthelastfewyears,thenumberofconvictedcriminalsgivencommunityservice
Since1981,whenthefarmdepressionbegan,thenumberofacresoverseenbyprof
Upsetbytherecentdownturninproductionnumbersduringthefirsthalfofthe
Therecentsurgeinthenumberofairplaneflightshascloggedthenation’sair-
LosAngeleshasahighernumberoffamilydwellingspercapitathananylargeci
Althoughnumbersofanimalsinagivenregionmayfluctuatefromyeartoyea
Althoughnumbersofanimalsinagivenregionmayfluctuatefromyeartoyea
随机试题
—Youwillhearfiveshortrecordings.—Foreachrecording,decidewhateachsp
Dynamiccommercialandtechnologicalforcesaredeepeningworldwideeconomic
WilliamwontheBattleofHastings.Later,on______,hewascrownedKingofEngl
HowtoWriteaDissertationI.TwonecessarypreparationsA
Whatdeterminesthekindofpersonyouare?Whatfactorsmakeyoumoreorle
Thediscoveryofplanetsarounddistantstarshasbecomelikespace-shuttlel
《义务教育数学课程标准(2011年版)》提出“四基”的课程目标,“四基”的内容
1、9、36、100、225、()。 A360 B400 C441 D
技术分析法的基点是事先分析,即在基本因素变动对证券市场发生影响之前,投资者已经在
关于散剂生产与贮藏有关规定的说法,错误的是A.儿科用散剂应为最细粉 B.局部用
最新回复
(
0
)