抛一枚硬币连续抛出两次正面的概率是多�?同样抛一枚硬币直至连续2次出现正面,此时抛的次数期望值为多�? 知乎 Template




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tomski抛一枚硬币连续抛出两次正面的概率是多�?同样抛一枚硬币直至连续2次出现正面,此时抛的次数期望值为多�? 知乎 coloring