2013 AMC 8 第 8 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
8.
一枚公平硬币被抛 次。至少出现两个连续正面的概率是多少？
A fair coin is tossed times. What is the probability of at least two consecutive heads?
小提示：
列出三次抛硬币的 种可能结果
List the possible outcomes of three coin tosses.
大提示：
只统计含有 的结果
Count only outcomes containing .
视频讲解：
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文字解答：
至少有两个连续正面的结果是 、 和 。三次公平抛硬币共有 个等可能结果，所以概率为 。
所以正确答案是 C。
The outcomes with at least two consecutive heads are , , and . There are equally likely outcomes from three fair coin tosses, so the probability is .
Thus, C is the correct answer.
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