n维墙角与e的估计
http://www.matrix67.com/blog/archives/3507
https://www.zhihu.com/question/64089362
记\(U_1,U_2,\dots\)为一列独立随机变量，均服从\((0,1]\)上的均匀分布。记
\[ \xi = \min\{n \geq 1: U_1+U_2+\dots+U_n > 1\}, \]
求\(E(\xi)\)。
Hello World
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