The well known mathematical formula is 1-(364/365)^(n*(n-1)/2). If i remember from university, to get a 50% likelihood of at least 1 match, you need 22-23 people.

It's boring cause there's too little! It feels like that takes birthdays at random as an assumption right? It's well known however that certain environments cause people to have more childbearing activities though, which cause more people to born around spring, relatively (9 months from summer-ish) or 9 months after a power outage

You're absolutely right TheAtom, not random however, just equally likely to be any date. what you are talking about would only set to increase the probability of having the same birthday... and could easily be calculated with more input data

The_stats_guy for certain for certain! For people outside statistics random and equally likely is somewhat synonymous I guess but I get what you mean. It's interesting however that the chances are this high :)

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