有一张图,这里贴不上来 我把题目贴下,做过得为我解答下
the figure above represents a system of roads along which traffic flows in the direction indicated by the arrow. 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?
A.87.5%
B.75%
C.62.5%
D.50%
E.12.5%
这道题是完全没有概念啊,答案是A。请前辈指点下
举报
图片找不到啊。。。
GWD的题,很简单啊。 答案是A。
你这么考虑就好了:从一开始有几条路,走每条路的概率1/n, 再往后,在原来的基础上继续1/m.....。从某个出口的总的可能是把走各条路的概率加起来,不过这题要稍微看下:走下面那部分路,纵然中间有很多分支,但最后都是从一个出口出的,就没必要管中间有多少条分支了。
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