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

Thiskindofcomputeris________handlingallkindsofinformation.

They______friendssincetheymetinShanghaitenyearsago.

Whatyou’realwaysheard?We’reeatingtoomuchsalt.TheaverageAmericangetsabout3.4gramsofsodiumeveryday,farmoreth

Airlinecompaniestodayrequirethatallluggage______morestrictly.

Thesystemsremainbasicallythesameas______inusehalfacenturyago.

Scientistsmeasuredtheimpactthatpeoplehaveontheenviromentusingatermcalledcarbon"footprint".Thatfootprintreflect

Woman:DoyougetthePublicBroadcastingSystemonTV?Man:Yes,everybodygetsPBS.【D5】______Woman:It’sboringandof

Studentsareexpectedto______theirclassesregularly.

Intherectangularquadrantsystemshownabove,whichquadrant,ifany,containsnopoint(x,y)thatsatisfiestheequationx2-2

Ifthetworootsoftheequation2x2-mx-(k-m)=0are6and2，whatisthevalueofk?

男性脊髓灰质炎后遗症患者，行走时右腿在支撑期不能保持伸膝稳定，上身前倾，重力线通过膝关节前方，使膝被动伸直，为制定合理的康复治疗方案，需对患者进行的功能评定不包括

不寐的治疗原则是

目前常用于脂蛋白电泳的技术为

用甲醛消毒导尿管，其常用浓度是()

只能由自然人享有的民事权利包括()。

注重教育的价值，对教育改造人的本性，形成社会所要求的知识、能力、态度等，都持积极乐观态度的是内发论。()

下列指令中，对软件设计者完全透明的指令是()。

产品生产者的责任是()。

[2009年1月]设直线nx+(n+1)y=1(n为正整数)与两坐标轴围成的三角形面积为Sn，n=1，2，…，2009，则S1+S2+…+S2009=()。

Whenyouarestartingasmallbusiness,youshouldwriteabusinessplan.Writingabusinessplanisthemostimportant【11】.Thi