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从0点出发，每次向正方向随机走1~k步，求踩到x的概率。为什么x趋于无穷大时，概率为2/...
source link: https://www.zhihu.com/question/336062847/answer/759852363
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有个标准的做法是用母函数（信号处理中叫z变换，基本一样），设 为踩到n的概率，则有 这是个标准的线…
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