没考好，不过还记得点今天的题——7月12日9点场

penny2012 · 发表于 2012-7-13 07:56:40

补充一题
X1=1；Y1=1；a,b为整数。Xn+1=a+Xn,Yn+1=b+Yn(n+1和n均为下标）求b?
条件：X2=Y2；X3=Y3

-- by 会员 penny2012 (2012/7/12 23:36:22)

这题Yn+1的式子可能是Yn+1=bYn,记不太清，大家都准备一下吧。

lbbasketball11 · 发表于 2012-7-13 10:00:15

should be 6. if you use 3 venn diagram to draw it out. the overlap areas would be condition 2: 52 people that knows at least 2 langauges. and then you subtract condition 1 which is 5 people know all 3 lanaguages. 52-3= 49. select C.

njuzl09 · 发表于 2012-7-13 10:43:04

NO.6 answer 23

Shirley55555 · 发表于 2012-7-15 17:10:12

恭喜楼主，请移步看看【Shirley版】的整理稿，帮忙找点错误出来！

萝姬：http://forum.chasedream.com/GMAT_Math/thread-737186-1-1.html

悦读：http://forum.chasedream.com/GMAT_Math/thread-737243-1-1.html

[原始] 没考好，不过还记得点今天的题——7月12日9点场

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