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From: eklhad@ihnet.UUCP (K. A. Dahlke)
Newsgroups: net.puzzle
Subject: permuting 0123456789
Message-ID: <200@ihnet.UUCP>
Date: Sun, 17-Feb-85 12:06:58 EST
Article-I.D.: ihnet.200
Posted: Sun Feb 17 12:06:58 1985
Date-Received: Tue, 19-Feb-85 07:56:37 EST
Distribution: net
Organization: AT&T Bell Laboratories
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< 3792156048 >

	Since I haven't seen anything resembling a puzzle in quite a while,
here is one.
	How many permutations of the digits 0-9 have no digits in common
with the identity permutation (0123456789)?
Examples:   2317495680 cannot be counted, since 4 and 8 are in the correct
position.  9876543210 is included, since no digit is in the correct position.
A numerical answer will do.
If you feel ambitious, try 26 letters (a-z) rather than 10 digits.
-- 
	Having, is not so pleasing a thing after all, as wanting.
	It is not logical, but it is often true.
Karl Dahlke    ihnp4!ihnet!eklhad