GMAT prep模考数学的一道题 ~

ljyjulia · 发表于 2010-10-31 19:57:36

To furnish a room in model home, an interior decorator is to select 2 chairs and 2 tables from a collection of chairs and tables in a warehouse that are different from each other. If there are 5 chairs in the warehouse and if 150 different combinations are possible, how many tables are in the warehouse?
A 6
B 8
C 10
D 15
E 30
做了好几遍都做不出这个答案
又谁能做下
答案是D
今天模考的时候唯独这道题完全算不出来

cutewen · 发表于 2010-10-31 21:43:53

C5 2 * C x 2= 150
cX 2 =15
x=6

做不出D- -

canberry123 · 发表于 2010-10-31 22:35:59

我也做的是A

ritarong · 发表于 2010-10-31 22:42:03

搂搂....
俺查了答案是A....

yuki14 · 发表于 2010-10-31 23:14:07

是A吧

ljyjulia · 发表于 2010-11-1 08:58:30

我也是A，好吧，一致推翻GMACC答案吧！

GMAT prep模考数学的一道题 ~

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