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From: lambert@mcvax.uucp (Lambert Meertens)
Newsgroups: sci.math
Subject: Re: a mathematical problem in psi (read it anyway, ok?)
Message-ID: <7149@boring.mcvax.UUCP>
Date: Wed, 19-Nov-86 03:03:39 EST
Article-I.D.: boring.7149
Posted: Wed Nov 19 03:03:39 1986
Date-Received: Wed, 19-Nov-86 22:35:16 EST
References: <8250@watrose.UUCP> <234@anucsd.OZ>
Reply-To: lambert@boring.uucp (Lambert Meertens)
Distribution: sci
Organization: CWI, Amsterdam
Lines: 18
Summary: Confirming solution
Apparently-To: rnews@mcvax


In article <234@anucsd.OZ> bdm@anucsd.OZ (Brendan McKay) writes:

> In article <8250@watrose.UUCP>, rpjday@watrose.UUCP (rpjday) writes:
> (paraphrased by bdm):
>> Take a deck containing 5 cards each of 5 different shapes: 25 cards in all.
>> "The subject" guesses which shape is on each card, one at a time.  [...]
>> One the other hand, if the subject is shown each card after guessing its
>> value, that information can be used to raise or lower the expected score.
>> By how much?
> [...]  I think the exact values are 2048941091/892371480 and
> 23148348523/2677114440, but I wouldn't swear to that.

I obtained the same exact values using a different computational strategy
(computing the result "bottom up", using a recurrence relation over the
shape distributions).
-- 

Lambert Meertens, CWI, Amsterdam; lambert@mcvax.UUCP