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Each time a certain coin is tossed, the probability is $$\frac{1}{2}$$ that it will land head up and $$\frac{1}{2}$$ that it will land tail up. If the coin is tossed 3 times, what is the probability that it will land heads up exactly twice?
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· 相关考点
6.4.1 古典概率
6.4.1 古典概率
以上解析由 考满分老师提供。
