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I would guess n!-(n-1)(n-1)!+(n-2)(n-2)!-(n-3)(n-3)!+...
Second floor seems not correct. For example. if n=3, only two cases 231 and 312. But second floor would give 3!(1-1/2!+1/3!)=4.
For n=4 case, it gave 15, which conflicts with 3 floor.
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5Â¥2015-03-25 19:59:03
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jabile

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n![1-(1/2!)+(1/3!)-(1/4!)+.........+(1/n!)]---> n! (1-1/e)
2Â¥2015-03-23 11:46:38
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2Â¥: Originally posted by jabile at 2015-03-23 11:46:38
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n!---> n! (1-1/e)

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3Â¥2015-03-23 22:34:59
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