Re: [計量] GWD2-15,16

看板GMAT (GMAT入學考試)作者 (小布)時間17年前 (2008/01/13 01:48), 編輯推噓1(100)
留言1則, 1人參與, 最新討論串2/3 (看更多)
※ 引述《candyme ()》之銘言: : 15. : Tanks A and B are each in the shape of a right circular cylinder. : The interior of tank A has a height of 10 meters and a circumference : of 8 meters and a circumference of 10 meters. The capacity of tank A : is what percent of the capacity of tank B ? : A.75% : B.80% : C.100% : D.120% : E.125% : ANS: B This question is incomplete. : 16. : Meg and Bob are among the 5 participants in a cycling race. If each : participant finishes the race and no two participants finish at the : same time, in how many different possible orders can the participants : finish the race so that Meg finishes ahead of Bob ? : A.24 : B.30 : C.60 : D.90 : E.120 : ANS:C : Thanks for your help!!! 4!+C3取1*3!+C2取1*3!+3! =24+18+12+6 =60 ^^^^^^^^Meg as Rank2, Bob can be one of three participants behind, and multiple premutation of other 3 players. Logic: First decide the rank of Meg and Bob, then consider the premutation of other 3 participants. ***Hope this helps to answer. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.229.98.114

01/13 18:27, , 1F
Thanks for ur solution:)
01/13 18:27, 1F
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