[理工] 離散 排列組合
想請教第109題
http://i.imgur.com/NI21jmK.jpg
為何不能用這個方法算,用這個方法算出來的個數為答案的兩倍
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推
10/21 18:05, , 1F
10/21 18:05, 1F
→
10/21 18:05, , 2F
10/21 18:05, 2F
→
10/21 18:05, , 3F
10/21 18:05, 3F
→
10/21 19:02, , 4F
10/21 19:02, 4F
→
10/21 19:02, , 5F
10/21 19:02, 5F
推
10/21 19:11, , 6F
10/21 19:11, 6F
→
10/21 19:11, , 7F
10/21 19:11, 7F
→
10/21 21:08, , 8F
10/21 21:08, 8F
推
10/21 23:38, , 9F
10/21 23:38, 9F
→
10/21 23:38, , 10F
10/21 23:38, 10F
→
10/22 13:42, , 11F
10/22 13:42, 11F
→
10/22 13:42, , 12F
10/22 13:42, 12F
→
10/22 17:59, , 13F
10/22 17:59, 13F
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