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