[RC5] Birthday Paradox

Lorenzo Gonzalez lgonzalez at nazdar.com
Fri Mar 20 13:57:51 EST 1998


>  As people enter a room, you record their birthdays.  How many people
> must enter the room before a duplicate birthday is recorded?
> While we are guaranteed a match after 365 people, only 23 people are
> required to have a 50% chance of finding a match.

My goodness, is this something you learn in stats?  I personally wouldn't
mind a quick little overview of why 23 equals 50% likelihood of a duplicate
of 365 possibilites...

It's a wonder I can understand juggler's siteswap notation...

Lorenzo Gonzalez
distributed jugglers
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