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

游客2024-01-12 29

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

Forshopaholics,thepost-【D1】______periodmeansonlyonething:sales.Acr

Whichnumbershouldreplacethequestionmark?[img]2018m1x/ct_eyyjsaz2017c_eyyj

Internationalairlineshaverediscoveredthebusinesstravelers,themanor

In______withtheregulations,allticketsmustbestamped.A、combinationB、agree

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某建设单位委托设计院承担办公楼设计任务，设计院在完成设计任务30%时，由于某种原

各重为P的两物块A和B用绳连接并将此绳缠绕在均质滑轮O上，如图所示，如滑轮半径为