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From: weemba@brahms.BERKELEY.EDU (Wimpy Math Grad Student)
Newsgroups: net.sci
Subject: Birthday matching
Message-ID: <14715@ucbvax.BERKELEY.EDU>
Date: Fri, 4-Jul-86 06:38:59 EDT
Article-I.D.: ucbvax.14715
Posted: Fri Jul  4 06:38:59 1986
Date-Received: Sat, 5-Jul-86 06:45:35 EDT
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Reply-To: weemba@brahms.BERKELEY.EDU (Wimpy Math Grad Student)
Organization: University of California, Berkeley
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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

ucbvax!brahms!weemba	Wimpy Grad Student/UCB Math Dept/Berkeley CA 94720