From: "r.e.s." Subject: Re: Pi in your face Date: Tue, 7 Sep 1999 16:01:40 -0700 Newsgroups: sci.math Keywords: formula for number of derangements http://www.unc.edu/~rowlett/Math148/notes/derange.html seems to have a nice derivation -- r.e.s. rs.1@mindspring.com Craig Johnston wrote ... : Slv wrote: : >> > Irrational numbers are the result of human error. : >> > They are numbers erected in ignorance of natural law. [...] : >Well, for your information, if you got seats with numbers : >on them, and people with numbers accordingly. : >For example: Seats: 1,2,3,4,5. People: 1,2,3,4,5. : > : >The number of ways for everyone to seat in the wrong seat : >involves PI(3.14...) and E(2.71...)!!! : > : >Well, this number of ways is quite a natural law... : >What have you got to say about that? [...] : BTW, what is this formula for number of derangements? : Could someone give a derivation?