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标题: GWD-1的排列组合题2 [打印本页]

作者: anita_tian 时间: 2009-11-2 22:01 标题: GWD-1的排列组合题2

A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row. The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her. How many such arrangements of the 6 people are possible?

A. 5
B. 6
C. 9
D. 24
E. 36

作者: James 时间: 2009-11-3 23:05

题目我不翻译了大概就是6个人两排每个人要比前面的人高每一排还必须右边的比左边的高

这个题目严格来说很难用真正的排列组合思维来做

并且这道题也是历年来GMAT考试中绝无仅有的一道难题

这个题目最简捷的办法就是枚举法也就是把这些东西都排出来：我们用123456表示6个人

456

123

356

124

256

134

246

135

346

125

如上5种

作者: anita_tian 时间: 2009-11-4 21:14

呵呵,真的是只有这种方法啊,我当时就是一个一个排的,还想有什么简单的方法可以计算呢

可怕的排列组合题,只要稍微难点,碰上一准死

作者: :-Dの 时间: 2010-3-19 17:41

排列组合题是挺恐怖的

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