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There are 5!, or 120, ways of arranging 5 different solid-colored flags side by side. If the colors of the flags are red, blue, yellow, green, and orange, how many of those arrangements have either the red flag or the blue flag in the middle position?
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· 相关考点
6.3.4 排列
6.3.4 排列
以上解析由 考满分老师提供。
