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feixiaolin: ÊýѧEPI+1, http://emuch.net/bbs/viewthread.php?tid=8740247&fpage=1 2015-04-01 19:14:18
It should be n!(1/2!-1/3!+1/4!-...+(-1)^n/n!)=n!-7floor.
If n=2, it's 1.
If n=3, it's 2
n=4, it's 9 etc. summation formula of probability but here is inverse. Thank 7 floor

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