In an office of 57 people, there is a 99% chance that there is a pair of people sharing a birth date

February 5, 2013

And there is a 50% chance that there is a pair of people sharing the same birth date in a group of 23 people. Below is an explanation of why this is the case.

birthday paradox

Read more awesome statictical riddles in this article on businessinsider.com

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