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[概率/统计] 包含正 101 边形中心那一块区域的周长的期望

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hbghlyj posted 2025-7-12 12:15 |Read mode
设 $\mathcal P$ 为一条外接圆半径为 1 的正 101 边形。对每条对角线,以概率 0.001 将其画出。这样会把 $\mathcal P$ 分割成若干个封闭区域。记 $E$ 为包含 $\mathcal P$ 圆心的那一块区域的周长的期望值。求 $\lfloor 10^{9} E \rfloor.$
答案 4771880153

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