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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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当前版本由 354261qil 更新于2024-07-04 17:43:37 感谢由 354261qil 对此题目的解答所做出的贡献。
红色在中间时，相当于把另外四种颜色按顺序排列到其余的四个位置中，共是A(4,4)=24种情况。蓝色在中间时同理，也是24种。因此满足题意的方案共有24+24=48种。
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当前版本由 192726vhux 更新于2025-06-24 11:02:42 感谢由 192726vhux 对此题目的解答所做出的贡献。
最快算法：红色或蓝色在中间的概率是2/5,那么题干告知一共120种排列，所以有120*2/5=48种排列。
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