In a group of 366 people, it is guaranteed 100% that two people share the same birthday. But a group of just 57 people still has 99% chance of having at least two people that share the same birthday. This assumes leap years don't exist and birthdays are evenly distributed. Interesting, right? It's all in probability theory. So, if your birthday is today, Happy Birthday, and have some cake!

See Also:

http://en.wikipedia.org/wiki/Birthday_paradoxlink to this puzzle
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