# Math

What is the probability of in a room with 15 people, there will be at least one shared birthday?

In a room of just 23 people there's a 50-50 chance of two people having the same birthday. In a room of 75 there's a 99.9% chance of two people matching. Put down the calculator and pitchfork, I don't speak heresy. The birthday paradox is strange, counter-intuitive, and completely true.

posted by PsyDAG

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