作者mqazz1 (无法显示)
看板Math
标题[离散] 排容 字母的排列
时间Sat Aug 6 20:13:23 2011
In how many ways can one arrange all of the letters in the word INFORMATION
so that no pair of consecutive letters occurs more than once?
请问这题要怎麽解?
谢谢
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