Re: [問題] GRE數學問題

看板GRE作者worm6206 (朕即天下)時間9年前 (2014/11/24 22:11)推噓8(8推 0噓 6→)

留言14則, 7人參與討論串2/2 (看更多)

※ 引述《konil (Q仔)》之銘言： : 大家好，有兩個問題想請教大家: : 1.A certain five-number committee must be assembled form a pool of 5 : women---A,B,C,D,E, and three men—X,Y,Z, what is the probability that the : committee will include B,C,E,Y and Z? 5取3 = (3*2*1) / (5*4*3) = 6 / 60 = 1/10 3取2 = (2*1) / (3*2) = 2 / 6 = 1/3 1/10 * 1/3 = 1/30 : A.1/30(ANS) B. 1/25 C.2/35 D. 1/15 E.3/32 : 2. On a certain number live, if -7 is a distance of 4 from n and 7 is a : distance of 18 from n then n=? 數線上的「-7」和「n」距離4. => n = -11 or -3 「 7」和「n」距離18. => n = 25 or -11 得到n = -11 -7 is (a distance of 4) from n 這樣看懂句子了吧↑ : A.25 B.11 C.3 D.-3 E -11(ANS) : 這題到底誰是距離誰是數列上的數字啊? 整個糊塗了... -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 1.175.130.176 ※ 文章網址: http://www.ptt.cc/bbs/GRE/M.1416838272.A.EAA.html

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11/25 11:42, , 1^F

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