GRE考试易错题（2016-1-25）

第1题：Inaninsurancecompany,eachpolicyhasapaperrecordandanelectricrecord.Forthosepolicieshavingincorrectpaperrecord,60%alsohavingincorrectelectricrecord;Forpolicieshavingincorrectelectricrecord,75%alsohavingincorrectpaperrecord.3%ofallpolicieshavebothincorrectpaperandincorrectelectricrecords.Ifwerandomlypickoutonepolicy,what’stheprobabilitythattheonehavingbothcorrectpaperandcorrectelectricrecords?() A.0.80 B.0.94 C.0.75 D.0.88 E.0.92

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第2题：IfBobcandoajobin20daysandJanecandothejobin30days,theyworktogethertodothisjobandinthisperiod,Bobstopworkfor2.5daysandJanestopworkforxdays,andthejobbefinishedfor14days,whatisx?() A.1.6 B.3.2 C.1.5 D.1.25 E.1.15

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第3题：TheprobabilityofAis60%andtheprobabilityofBis50%,whatisthemostpossibleprobabilitythatneitherAnorBwouldhappen?() A.0.80 B.0.40 C.0.75 D.0.55 E.0.68

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第4题：Thereare1200respondentstoapoll,eachfavoringtheirpreferenceforcandidatesA,B,andC.54%favoredA,48%favoredB,and42%favoredC,andthereis30%favoredbothAandB.what’sthelargestpossiblenumberofrespondentsfavoringC,butnotC&B,norC&A?() A.25% B.30% C.28% D.38% E.40%

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