Confronted by a randomly selected group of people,1 one may ask, What is the probability that at least one other person in the group shares my birthday? While this may be easy to ask, answering it is less easy. Let's try.

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1. 1 I declare this to be my own work, entirely. In particular, no AI was used in any research, analysis, synthesis, writing, nor typesetting of this work. In short, AI was not recruited at any time in this work. Errors and inaccuracies are therefore proudly my own.

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