首页
登录
职称英语
The number of connections C that can be made through a switchboard to which T te
The number of connections C that can be made through a switchboard to which T te
游客
2024-01-12
30
管理
问题
The number of connections C that can be made through a switchboard to which T telephones are connected is given by the formula C = T(T-1)/2. How many more connections are possible with 30 telephones than with 20 telephones?
选项
A、435
B、245
C、190
D、45
E、10
答案
B
解析
连接有T门电话的交换机所能形成的连络数目C由公式C=T(t-1)/2给定。30门电话能比20门电话多出多少连络?
解:本题的正确答案是(B)。30门电话的连络数目:C(30)=30×(30-1)/2=435;20门电话的连络数目:C(20)=20×(20-1)=190;C(30)-C(20)=435-190=245
转载请注明原文地址:https://tihaiku.com/zcyy/3356736.html
相关试题推荐
Foranynumbersaandb,ab=ab(3-b).Ifaandabbothrepresentpositivenumbers
Thereare450birdsatasmallzoo.Thenumberofbirdsis5timesthenumberof
Forany3givennumbers,whichofthefollowingisalwaysequivalenttoaddingt
ListA,BandCmeansthelistofmultiplesofprimenumbers2,3,and5respect
Whatisthetotalnumberofdifferent5-digitintegersthatcontainallofthed
Thenumbers3,10,17,24,31and38arethefirstsixtermsofaninfinitesequ
Eachof5positivewholenumbersisatleast8.Theaverage(arithmeticmean)oft
Howmany3-digitnumbersbetween100and200haveadigitthatistheaverageof
Alisthas100numbers,theexpectationofthelistis10andthestandarddevia
Threedice,eachwithfacesnumbered1through6,weretossedontoagameboard.
随机试题
OneofthemostinterestingparadoxesinAmericatodayisthatHarvardUniv
UntilshespokeIhadn’trealizedshewasforeign.A、她说话了我才意识到她从国外来。B、直到她说话,我也不知
使用( )命令可以释放当前主机自动获取的IP地址。A.ipconfig/all
属于疏散外风的方剂不包括A.川芎茶调散 B.玉真散 C.牵正散 D.天麻钩
以下哪项不是脐膨出的病理特点A.部分腹腔脏器通过前腹壁正中的先天性皮肤缺损突入脐
以下关于股份公司设立说法正确的有( )A.采取发起设立方式设立的股份公司,在发
个案研究中常用的研究方法主要有()。 A.跟踪法 B.追因法 C.临床法
有补体参与的变态反应性疾病是A.支气管哮喘 B.青霉素引起的休克 C.粒细胞
在资格审查中,( )属于详细审查的因素。A.申请文件的格式 B.联合体是否具
施工项目的工程担保中,保证期限因保证内容和风险不同而各异。下列保证方式中,保证期
最新回复
(
0
)