[中學] 排列組合問題
題目 :由1,2,3,4......,寫到9876共寫了___個0?
http://i.imgur.com/1yEMmTk.jpg
解答是2867
想知道我的解法哪裡出錯了呢?
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推
08/08 19:11, , 1F
08/08 19:11, 1F
→
08/08 19:19, , 2F
08/08 19:19, 2F
推
08/08 19:43, , 3F
08/08 19:43, 3F
→
08/08 20:36, , 4F
08/08 20:36, 4F
→
08/08 20:36, , 5F
08/08 20:36, 5F
→
08/08 20:36, , 6F
08/08 20:36, 6F
→
08/08 20:41, , 7F
08/08 20:41, 7F
→
08/08 20:42, , 8F
08/08 20:42, 8F
→
08/08 20:50, , 9F
08/08 20:50, 9F
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