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题目内容
Each morning Betty walks from intersection P to intersection R, always walking along streets shown in the figure above and always going east or north. If she varies her walks as much as possible, taking every different path in turn before repeating the sequence of paths, on how many mornings in 48 consecutive mornings will Betty walk through intersection Q?
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· 相关考点
6.4.1 古典概率 6.3.4 组合 6.3.1 计数原理
6.4.1 古典概率
6.3.4 组合
6.3.1 计数原理
以上解析由 考满分老师提供。