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From: rb@cci632.UUCP (Rex Ballard)
Newsgroups: net.sci
Subject: Re: Birthday matching
Message-ID: <215@cci632.UUCP>
Date: Fri, 11-Jul-86 23:16:15 EDT
Article-I.D.: cci632.215
Posted: Fri Jul 11 23:16:15 1986
Date-Received: Wed, 16-Jul-86 05:36:01 EDT
References: <3719@decwrl.DEC.COM> <136@cci632.UUCP> <1314@psivax.UUCP> <14715@ucbvax.BERKELEY.EDU>
Reply-To: rb@ccird1.UUCP (Rex Ballard)
Organization: CCI, Rochester Development, Rochester, NY
Lines: 19
Summary: Now for the sticker.

In article <14715@ucbvax.BERKELEY.EDU> weemba@brahms.BERKELEY.EDU (Wimpy Math Grad Student) writes:
>In article <1314@psivax.UUCP> friesen@psivax.UUCP (Stanley Friesen) writes:
>>                                            Take a group of about
>>20 people, what do you think the chances of two of them having the
>>same birthday are? In point of fact, it is virtually certain that
>>there will be at least one such pair!
>
>Uh, not exactly.  Here's a list of some of the probabilities of a match:
>
>23: 0.5073	32: 0.7533	41: 0.9032	50: 0.9704	57: 0.9901
>

Now what are the odds that one other person would have the same
birthday as me?  What were the odds that the speaker, and one
of those in the audience would have the same thought?

The trick here is that both have a "context", earlier speakers
for example, which will subconciously guide them to extend into
the same thought.  The question is HOW?