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i always heard it called the birthday problem: https://en.wikipedia.org/wiki/Birthday_problem

[weirdly, someone discovered an birthday overlap today at work and i just re-google/wiki'd this today]

Huh, what are the odds that the same mathematical concept will come up in conversation twice on one day? We have invented the Synchronicity paradox, er, problem.

Baader–Meinhof phenomenon or frequency illusion.

Sadly nobody called it baader-meinhof paradox.

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