Pólya urn model - Wikipedia

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ROAM_REFS: https://en.wikipedia.org/wiki/Pólya_urn_model

The model represents objects of interest (such as atoms, people, cars, etc.) as colored balls in an urn. In the basic Pólya urn model, the experimenter puts x white and y black balls into an urn. At each step, one ball is drawn uniformly at random from the urn, and its color observed; it is then returned in the urn, and an additional ball of the same color is added to the urn.

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