n种瓶盖，每种都有无穷多个，求选择到每种瓶盖各一次的期望 | Dami

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n种瓶盖，每种都有无穷多个，求选择到每种瓶盖各一次的期望

10 years, 6 months ago

Venial

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Venial 10 years, 6 months ago

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