Re: [解題] 高中數學 排列組合
其實不用把它想的這麼複雜吧
反正是全取做環狀排列
我就先抽出一朵紅花
固定他為排頭
剩下的人 就變成作直線排列
也就是
7 !
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4! 3!
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推
03/22 00:01, , 1F
03/22 00:01, 1F
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03/22 00:02, , 2F
03/22 00:02, 2F
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03/22 00:02, , 3F
03/22 00:02, 3F
推
03/22 07:22, , 4F
03/22 07:22, 4F
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03/22 07:24, , 5F
03/22 07:24, 5F
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03/22 07:25, , 6F
03/22 07:25, 6F
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03/22 12:59, , 7F
03/22 12:59, 7F
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