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
2025-02-23
30
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/3969298.html
相关试题推荐
Alanguageclasshas155students.80ofthemcanspeakEnglish,40ofthemcan
RATIOCINATION:LOGIC::A、comprehension:pedagogyB、interpretation:languageC、orth
Muchofcomputerscienceworkdoesnotinvolvethesudden______ofnewlanguages
Inthecanonicalwritingoftheculturalessentialists,languagehas
Inthecanonicalwritingoftheculturalessentialists,languagehas
Inthecanonicalwritingoftheculturalessentialists,languagehas
Inthecanonicalwritingoftheculturalessentialists,languagehas
Inthecanonicalwritingoftheculturalessentialists,languagehas
RATIOCINATION:LOGIC::A、comprehension:pedagogyB、interpretation:languageC、o
Thelanguageofthebureaucratsandadministratorsmustneedsberecognizedas_
随机试题
[audioFiles]audio_eusm_j01_113(20099)[/audioFiles]A、Theyareattendingaconcer
Whatkindofjobdoyouwanttodointhefuture? Iwanttobeanarchitectin
[originaltext]AfterlivinginEnglandfor20years,mywifeandIdecidedt
某房地产开发集团将某高档小区建设项目发包给天鼎建设公司承建。为早日开盘追回投资,
在安全通信中,S将所发送的信息使用(请作答此空)进行数字签名,T收到该消息后
以下不合理处方的问题中,可判为超常处方的是A.重复用药 B.联合用药不适宜
下列关于管道运输货物的表述正确的是: A.管道运输货物是指通过跨境管道运输方式
2015年某公司共有员工300人,这些员工的工资水平从低到高分为一级到五级。该公
当采取某项投资控制措施时,如果该项措施会对进度目标和质量目标产生不利影响,就应考
下列药物中,具有强心作用的是( )。A.氨茶碱 B.乙酰唑胺 C.呋塞米
最新回复
(
0
)