Martha invited 4 friends to go with her to the movies. There are 120 different w

游客2024-01-12 38

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 w

Ounceforounce,blendsofdifferentartificialsweetenersmatchanyindividual

InspectionsystemXandinspectionsystemY,thoughbasedondifferentprinciple

Gall’shypothesisoftherebeingdifferentmentalfunctionslocalizedindiffere

Somebatcaves,likehoneybeehives,haveresidentsthattakeondifferentdutie

Ifn=pqr,wherep,q,andrarethreedifferentpositiveprimenumbers,howma

Thesumofndifferentpositiveintegersislessthan100.Whatisthegreatest

Apositiveintegerwithexactlytwodifferentdivisorsgreaterthan1mustbeA、a

Twodifferentpositiveintegersxandyareselectedfromtheoddintegersthat

Fromaboxof10lightbulbs,youaretoremove4.Howmanydifferentsetsof4l

Marthainvited4friendstogowithhertothemovies.Thereare120differentw

Makesureyourheadsetison.TheWritingsectionmeasuresyourability

【B1】[br]【B7】A、nothingbutB、nothinglikeC、anythingbutD、anythinglikeCnothi

[originaltext]M:It’ssuchabeautifulday.Whynotsitoutinthebackyardfor

Surprisingly,nooneknowshowmanychildrenreceiveeducationinEnglishho

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陕西某高校一位副教授因高热住进职工医院，经B超、CT、胃检、抽血、抽骨髓化验等检

饭店账户上存款余额与银行账户上所示存款余额之间的差额是（ ）。A.应收账款

A齐次线性方程组，当变量的个数与方程的个数相同时，方程组有非零的充要条件是系数行列式为零。即

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