请教一道题.

isabeling3 · 发表于 2011-9-23 11:52:39

The figure above represents a system of roads along which traffic flows in the direction indicated by the arrows. If the traffic were to split evenly at each fork of the road system, what percent of the traffic entering fork C would exit at Y?

87.5%

75%

62.5%

50%

12.5%

isabeling3 · 发表于 2011-9-24 17:14:21

哈哈，懂了，谢谢啊！！

wyw1018 · 发表于 2011-9-23 12:02:05

用减法
通过X的概率为0.5×0.5×0.5=0.125
则通过Y的概率为1-0.125=0.875

请教一道题.

所属分类: GMAT考试

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