标题: 一道排列组合题，~~~~求救 [打印本页]

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作者: michael_wind    时间: 2010-7-16 07:21     标题: 一道排列组合题，~~~~求救

Q33:
A photographerwill 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
绿色的为正确答案

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作者: linmeimei    时间: 2010-7-16 22:17

345    356     346    256     246
123    124     125    134     135

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作者: bettytons    时间: 2010-7-17 06:42

对 我也是一个一个排出来的，但是花了很长时间。
估计考场上遇到此类题要OVER了。
所以记得有人说，给足了时间GMAT都可以考高分。 的确是的。
低分可能因为反应不够快！

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作者: michael_wind    时间: 2010-7-18 19:42

多谢楼上两位，看来也只有这个办法了~~~呵呵，三楼的实在经典，确实反应不够快

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