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From: ndiamond@watdaisy.UUCP (Norman Diamond)
Newsgroups: net.puzzle
Subject: Re: a good interview question (manhole covers)
Message-ID: <7084@watdaisy.UUCP>
Date: Mon, 18-Mar-85 14:21:44 EST
Article-I.D.: watdaisy.7084
Posted: Mon Mar 18 14:21:44 1985
Date-Received: Tue, 19-Mar-85 03:45:38 EST
References: <1300@ut-sally.UUCP> <441@hou2b.UUCP> <9248@brl-tgr.ARPA>
Organization: U of Waterloo, Ontario
Lines: 20

> > There is a shape other than a circle which would prevent the manhole
> > cover from falling through.  What is it?
> 
> There are several.
> 	Triangle, pentagon, etc...
> -Ron

Triangles and pentagons WILL fall through if oriented appropriately.
Sicherman's solutions (already posted, based on an article by Martin Gardner,
originally due to ????) are correct answers.

-- 

   Norman Diamond

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