回複:2*4!可以理解,5!仍不太明白。anyway, thank you!

來源: jinjing 2010-04-17 05:43:11 [] [舊帖] [給我悄悄話] 本文已被閱讀: 次 (161 bytes)
回答: 回複:details? please!jinjing2010-04-16 16:00:53
We get a circle first and put 123456 on it.6 has to been connected 1 and/or 5 .If 5 between 1 and 5 OK,if out,as there four sections,two are OK two not OK.So,...
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