[ANNOUNCE] London Perl Mongers Technical Meeting 12th April 2010

[Denny]

On Sat, 2010-03-27 at 18:16 +0000, Dave Cross wrote:
> On 03/27/2010 09:10 AM, Luis Motta Campos wrote:
> > Dave Cross wrote:
> >> On 03/27/2010 08:13 AM, Uri Guttman wrote:
> >>
> >>> and paul and i share the same birthday. not sure what that means.
> >>
> >> I expect you'll find it's a coincidence :-)
> >
> > As a mathematician I must say coincidences have really low probability
> > of happening...
> 
> Given the number of people who have birthdays and the relatively small 
> number of days available to have them on - you might want to recheck 
> your working there :)

This is a common example given when pointing out that people don't
understand probability theory.

http://en.wikipedia.org/wiki/Birthday_problem

In a group of at least 23 randomly chosen people, there is more than 50%
probability that some pair of them will have the same birthday.  [...]
For 57 or more people, the probability is more than 99%

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