作者LPH66 (-858993460)
看板puzzle
標題[中譯] PuzzleUp 2010 (16) Generating 9-Letter Codes
時間Wed Oct 27 19:22:00 2010
首頁:
http://www.puzzleup.com/2010/
時限:2010/10/28(四)19:00~11/03(三)18:59
答案可上傳5次,但每改1次扣20分(基本分為100分)
在比賽期間內可隨時回答,但只有在時限內回答者有額外加分
◆Generating 9-Letter Codes
You will generate 9-letter codes changing the places of letters in the word
TRANSFORM. The condition is that none of the letters in the generated codes
will be on the same place as they were on the word TRANSFORM.
How many different codes can be generated?
Example: If the same question was asked for 4-letter codes with the letters
of the word DATA, the answer would be 2: ADAT, ATAD.
要產生由單字 TRANSFORM 重排字母後的九字母編碼,
但產生的編碼的每個字母都不在原來 TRANSFORM 一字的位置上。
問有幾種如此的編碼?
例: 若題目是問由 DATA 一字重排,則共有 ADAT, ATAD 兩種。
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◆ From: 140.112.30.139
→ utomaya:這題可以用筆算 就是用排容定律去解 10/27 19:41
推 meowth:.......................................... 10/27 20:42
※ 編輯: LPH66 來自: 140.112.30.139 (10/27 22:37)