Martha invited 4 friends to go with her to the movies. There are 120 different ways in which they can sit together in a row of 5

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问题 Martha invited 4 friends to go with her to the movies. There are 120 different ways in which they can sit together in a row of 5 seats, one person per seat. In how many of those ways is Martha sitting in the middle seat?

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答案24

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Martha invited 4 friends to go with her to the movies. There are 120 different ways in which they can sit together in a row of 5

GRE QUANTITATIVE

GRE

WhenIwasyoung,Ispentmysummervacationsonmygrandparents’farm.ThesummerthatIgraduatedfromcollege,I【C1】______my

Ihaveafriendwhoputhercareeronholdaftershegotmarriedandhadchildren.Shestayedathomeuntiltheoldestwasfour

Thesuddenchangeofweathermadethetemperature______alot.

(77)Muchunfriendlyfeelingtowardscomputershasbeenbasedonthefearofwidespreadunemploymentresultingfromtheirintrodu

Thereasonwhysomepeopleareunlikelytosucceedinlifeisthatthey______.Whichofthefollowingstatementsismostimpor

Inwhatnowseemsliketheprehistorictimesofcomputerhistory,theearlypostwarera,therewasaquitewidespreadconcernth

Scientistssaidtheyhavefoundevidenceofagiantplanetfaroutinoursolarsystem.Inastatement,theCaliforniaInstitute

SpeakerA:I’dlikeabeer.SpeakerB:Certainlysir,______

Acertainbrandofhousepaintmustbepurchasedeitherinquartsat$12eachoringallonsat$18each．Apainterneedsa3-gall

Alongwiththedropinproducerpricesannouncedyesterday,thestrongretailsalesfigurereleasedtodayseemlikeitisindica

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归档文件整理时，归档的文件应当齐全完整，这是归档文件的基本要求。

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血药浓度受注射部位血流速度、pH及制剂影响大，维持有效血药浓度较长的是

血清及尿液的α-淀粉酶升高，哪种疾病应除外

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