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.
It’s not an actual paradox, it’s just something that is counter intuitive. Others have it explained it well, I just wanted to add that definition though.
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