标题: GMAT prep模考数学的一道题 ~ [打印本页] 作者: ljyjulia 时间: 2010-10-31 19:57 标题: GMAT prep模考数学的一道题 ~ 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作者: cutewen 时间: 2010-10-31 21:43
C5 2 * C x 2= 150 cX 2 =15 x=6
