What’s the birthday paradox

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So the birthday paradox is where if you’re in a room with 23 other people there’s a 50% chance of at least two people having the same birthday. Alternatively, In a room of 75 there’s a 99.9% chance of at least two people matching.

Why is this?

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[https://www.reddit.com/r/explainlikeimfive/search/?q=birthday%20paradox](https://www.reddit.com/r/explainlikeimfive/search/?q=birthday%20paradox)

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