抛一枚硬币，直至首次出现连续两个正面停止，如何求抛掷次数的方差？ 知乎 Sketch Coloring Page

抛一枚硬币，直至首次出现连续两个正面停止，如何求抛掷次数的方差？ 知乎 Template

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tomski抛一枚硬币，直至首次出现连续两个正面停止，如何求抛掷次数的方差？ 知乎 coloring

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