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

游客2025-02-23 35

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

Marthainvited4friendstogowithhertothemovies.Thereare120differentw

Howmanydifferentfive-digitpositiveintegerscanbeformedusingthedigits1

Halhas4girlfriendsand5boyfriends.InhowmanydifferentwayscanHalinv

Inadistributionof850differentmeasurements,xcentimetersisatthe73rdpe

Inhowmanydifferentwayscan5identicalbluebooks,3identicalyellowbooks,

Ifn=pqr,wherep,q,andrarethreedifferentprimenumbers,howmanydiffere

Inhowmanydifferentwayscan3boysand3girlsbeseatedinarowof6chairs

Ifxandyaredifferentprimenumbers,eachgreaterthan2,whichofthefollow

Ifx,yandzaredifferentpositiveintegerslessthan10,whatisthegreatest

Whatisthetotalnumberofdifferent5-digitintegersthatcontainallofthed

AThedawningeraofmicromarketingholdsgreatpromiseforconsumermarket

Cheating:Theincometaxdeadline(最后期限)approachesandsometaxpayers’thoug

KofiAnnansayshelpingsurvivorsoflastweek’searthquakeand【C1】______in

[originaltext]Interviewer(M)Dr.JoanneGetsy(W)Now,listentoPartOneofthe

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按规范规定，100m3丙类液体储罐与10kV架空电力线的最近水平距离应不小于电杆

岩石种类很多，按其成因可分为（）。A.岩浆岩 B.沉积岩 C.变质岩

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