Birthday Paradox
The Birthday Paradox is an interesting phenomenon, which is usually first observed in school classrooms:
In the average school classroom of 30 students, there is a high probability that at least 2 children will share the same birthday.
In the average school classroom of 30 students, there is a high probability that at least 2 children will share the same birthday.
More information can be found here: https://en.wikipedia.org/wiki/Birthday_problem
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