GRE习题练习

GRE考试易错题(2017/9/15)
1题:符合 X^2+Y^2<=100的整数解共有多少对?
【分析题】:

2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
【分析题】:

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

4题:IfBobcandoajobin20daysandJanecandothejobin30days,theyworktogethertodothisjobandinthisperiod,Bobstopworkfor2.5daysandJanestopworkforxdays,andthejobbefinishedfor14days,whatisx?()
A.1.6
B.3.2
C.1.5
D.1.25
E.1.15
【分析题】:

5题:A,B,C,D,E,F排在1,2,3,4,5,6六个位置上,问A不在1,B不在2,C不在3的情况下,共有多少种排法?()
A.720
B.450
C.180
D.216
E.320
【分析题】:

 

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