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- Newsgroups: rec.puzzles
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!cs.utexas.edu!convex!convex!joelw
- From: joelw@convex.com (Joel Williamson)
- Subject: Re: Monty Hall Puzzle RIP
- Sender: usenet@news.eng.convex.com (news access account)
- Message-ID: <1992Dec23.192457.13131@news.eng.convex.com>
- Date: Wed, 23 Dec 1992 19:24:57 GMT
- References: <92353.100332SHERE@SLACVM.SLAC.STANFORD.EDU> <1h2s25INNfm0@gap.caltech.edu>
- Nntp-Posting-Host: mozart.convex.com
- Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
- X-Disclaimer: This message was written by a user at CONVEX Computer
- Corp. The opinions expressed are those of the user and
- not necessarily those of CONVEX.
- Lines: 25
-
- In article <1h2s25INNfm0@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes:
- >In article <92353.100332SHERE@SLACVM.SLAC.STANFORD.EDU>, <SHERE@SLACVM.SLAC.STANFORD.EDU> writes:
- >=change after being shown a door and put together a simple chart
- >=detailing each possible permutation of how the game can progress
- >=you will have the following:
- >=
- >= Permutation: A B C D E F G H I J K L M N O P Q R S T U V W X
- >=
- >=Prize behind door: 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3
- >=Originally choose: 1 1 1 1 2 2 3 3 1 1 2 2 2 2 3 3 1 1 2 2 3 3 3 3
- >= Door shown: 2 2 3 3 3 3 2 2 3 3 1 1 3 3 1 1 2 2 1 1 1 1 2 2
- >= Change or Stay: S C S C S C S C S C S C S C S C S C S C S C S C
- >= Final choice: 1 3 1 2 2 1 3 1 1 2 2 3 2 1 3 2 1 3 2 3 3 2 3 1
- >= Win or Lose: W L W L L W L W L W W L W L L W L W L W W L W L
- >=
-
- What is wrong with this chart is: On average you will originally choose
- the prize door 1/3 of the time. The chart shows this happening 1/2 of
- the time. In other words, columns C&D, M&N, and W&X are redundant and
- should be eliminated. When this is done you see that you win 2/3 of the
- time by switching.
-
- Joel Williamson
- --
-
-