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From: greg@harvard.UUCP (Greg)
Newsgroups: net.math
Subject: Combinatorics question...
Message-ID: <736@harvard.UUCP>
Date: Tue, 25-Feb-86 15:03:56 EST
Article-I.D.: harvard.736
Posted: Tue Feb 25 15:03:56 1986
Date-Received: Fri, 28-Feb-86 06:32:17 EST
Organization: Harvard
Lines: 7

While playing with the little 8x8 patterns on my Macintosh, the following
question occured to me:

How many 8x8 matrices of 0's and 1's are there in which each row and column
has precisely four 1's?
-- 
gregregreg