ELI5 version:
It only takes 23 people before two people probably share a birthday.
This sounds weird, but it’s because you’re comparing Person 1’s birthday to Person 2, and Person 3, and Person 4, etc…and then *also* comparing Person 2’s birthday to Person 3, Person 4, etc…and then *also* comparing Person 3’s birthday to Person 4, Person 5, etc…
The number of comparisons you’re doing is way, way, *way* more than 23.
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