用123456六個數組成一個六位數, 要求任何相鄰的兩個數互質, 能組成多少個六位數?
忘了把原題寫完整,應該是:
用123456六個數組成一個六位數, 要求任何相鄰的兩個數互質, 能組成多少個六位數?
所有跟帖:
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回複:忘了把原題寫完整,應該是:
-sqgs-
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04/13/2010 postreply
12:58:36
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你有沒有考慮
-SwiperTheFox-
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04/13/2010 postreply
13:21:33
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144
-jinjing-
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04/13/2010 postreply
20:28:01
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no
-SwiperTheFox-
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04/14/2010 postreply
08:21:48
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70
-jinjing-
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04/14/2010 postreply
17:33:29
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You are close, but not exactly
-SwiperTheFox-
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04/15/2010 postreply
09:55:41
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72=(5!-4!*2)
-jinjing-
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04/15/2010 postreply
13:26:38
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This seems to be the best solution, can you reveal details?
-SwiperTheFox-
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04/16/2010 postreply
09:44:10
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Thanks.
-jinjing-
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04/17/2010 postreply
05:17:39
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details? please!
-皆兄弟也-
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04/16/2010 postreply
12:19:17
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回複:details? please!
-jinjing-
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04/16/2010 postreply
16:00:53
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2*4!可以理解,5!仍不太明白。anyway, thank you!
-皆兄弟也-
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04/16/2010 postreply
20:55:59
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回複:2*4!可以理解,5!仍不太明白。anyway, thank you!
-jinjing-
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(161 bytes)
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04/17/2010 postreply
05:43:11