抛硬币,正面�上的概率是三分之一,连续抛四次,出现至�一次正面�上的概率是多�? 知乎 Template




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tomski抛硬币,正面�上的概率是三分之一,连续抛四次,出现至�一次正面�上的概率是多�? 知乎 coloring