首页
登录
职称英语
A language class has 155 students. 80 of them can speak English, 40 of them can
A language class has 155 students. 80 of them can speak English, 40 of them can
游客
2025-02-27
36
管理
问题
A language class has 155 students. 80 of them can speak English, 40 of them can speak Russian, and 60 of them can speak French. There are 50 of them can speak exactly two languages, and 10 can speak all three kind languages. What is the number of the student that can speak none of the language?
选项
A、7
B、10
C、15
D、45
E、25
答案
D
解析
按照集合的理论:设集合A为speaking English,集合B为speaking Russian,集合C为speaking French,则A=80,B=40,C=60,A∩B∩C=10,Total=155,有些考生认为A∩B+A∩C+B∩C=50,这也是做错本题的原因,注意There are 50 of them can speak exactly two languages,并不包括能够说all three kind languages的10人,所以实际上A∩B+A∩C+B∩C=50+3×10。
A∪B∪C=A+B+C-(A∩B+A∩C+B∩C)+A∩B∩C
=80+40+60-(50+3×10)+10
=180-50-2×10=110
不能说任何一门语言的人=Total-A∪B∪C=155-110=45,选择D。
转载请注明原文地址:https://tihaiku.com/zcyy/3974758.html
相关试题推荐
KingSchoolhasanenrollmentof900students.Theschooldayconsistsof6clas
WheneveraFrenchnovelistranslatedintoEnglish,theeditionsoldinBritain
Grammarianshaveforyearscondemnedasungrammati-caltheEnglishphrase"betwe
Inarecentexperiment,ahighschoolEnglishteacherinterspersedreal,commonl
SpeakersoftheCaronianlanguageconstituteaminorityofthepopulationinsev
Researchduringthepastseveraldecadesonthenatureoflanguageandtheproce
WhereoncetheunionhadacquiescedtotheprejudicesofitsEnglish-speakingme
Supposeyouwanttoselecta3-personcommitteefromagroupof9students.How
Feministcriticshaveoftenponderedwhetherapostmodernlanguagemay
A、AmelancholyatmosphereB、TheuseofreligiousfigurallanguageC、Arejection
随机试题
Thespeakersaysthatthepercentageofbusinessesthatarefamilyrunis[br]W
夜色中看这堵围墙,十分奇妙,颇有点诗意。白墙、黑瓦、宝蓝色的漏窗泛出晶莹的光辉,里面的灯光从漏窗中透出来,那光线也变得绿莹莹的。清风吹来,树枝摇曳,灯光
A.appearanceB.appropriateC.attractiveD.complexE.concern
【S1】[br]【S10】on→over本题考查动词短语用法。takeon意为“雇用”。takeover指“接管,接受,占用”。
在设计节水型居住小区时,需计算年绿化浇灌用水量及平均日绿化浇灌用水量。该小区室外
A.哌甲酯 B.地西泮 C.苯巴比妥 D.丙戊酸钠 E.匹莫林多动性障碍
患儿男,3周,因发热3天,呕吐、精神差1天入院,查体:皮肤色素深,脱水明显,阴茎
填写开户资料时,理财师可获得的客户的基本信息不包括()A.证件信息 B.联
在融资融券业务的决策与授权体系下,业务决策机构负责( )。 I制定融资融券
交通运输外部性的层次可分为( )。 A.供给外部性 B.使用外部性
最新回复
(
0
)