Magoosh GMAT IR 题目有错？

lubaluba · 发表于 2012-7-9 18:02:13

下了Magoosh IR电子书，不错，不过有个问题纠结了，42页 Graphics Interpretation Practice question里第3个问题问

3) If a Grangerville high school with either a dedicated computer lab or a computer in every classroom is chosen, the probability that it will be a public school is:
A.20%
B.33.3 %
C.40%
D.42.9%
E. 44.4%

答案D 问题是Either or 不是应该是两者择其一么，怎么这里把两个圈重叠的部分也算进去了呢? 如果是两者择其一的话，应该是6/11才对，不过没有这选项，所以只能认可选择D,是不是题目出错了呢？请各位指正呀，谢谢！
以下是官方答案:
3. Answer: D
There are 14 schools in one of the two Venn circles – those are the schools either with dedicated computer labs or a computer in every classroom. Of those schools, 6 are public: the four red squares in the left Venn circle, and the two in the right Venn circle. 6/14*100 = 42.9%.

Magoosh GMAT IR 题目有错？

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