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

游客2024-01-12 59

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

Howlonghadthemanbeenwaitingforher?A、Nearlyanhour.B、Morethananhour.

Airpollutiontriggersmoreheartattacksthanusingcocaineandposesashi

【B1】[br]【B16】A、inB、atC、byD、withB固定搭配题，atistcore意为“核心是……”。

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每当幼儿询问诸如“天为什么会下雨”“大人为什么要结婚”类似的问题时，孙老师总是批

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