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Feb 21, 2020 at 1:09 history edited RobPratt
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Feb 21, 2020 at 1:00 review Reopen votes
Feb 21, 2020 at 1:43
Feb 21, 2020 at 0:44 history edited James Doucette CC BY-SA 4.0
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Feb 18, 2020 at 7:49 history closed David K
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Duplicate of Probability of 3 people in a room of 30 having the same birthday
Feb 18, 2020 at 2:05 review Close votes
Feb 18, 2020 at 7:50
Feb 18, 2020 at 1:56 comment added David K This is also relevant and has useful information in its answers: stats.stackexchange.com/questions/1308/…
Feb 18, 2020 at 1:49 comment added David K Note that the linked question itself (and the accepted answer) only mention the case where $3$ people share a birthday, but other answers discuss various ways to compute exact or approximate probabilities for $M$ people sharing a birthday for some arbitrary positive integer $M$.
Feb 18, 2020 at 1:00 answer added vonbrand timeline score: 3
Feb 18, 2020 at 0:53 comment added WaveX Sometimes approximations / simulations can be a good thing and a time saver. Here is a Math.SE post in the case of $3$ people sharing a birthday out of $30$ people and you can see how complicated the answer gets for it. I would imagine it would be further complicated for your case but perhaps not impossible to use inspiration from that post to construct a solution that would work
Feb 18, 2020 at 0:25 history asked James Doucette CC BY-SA 4.0