Negative multinomial distribution
In probability theory and statistics, the negative multinomial distribution is a generalization of the negative binomial distribution (NB(x0, p)) to more than two outcomes. As with the univariate negative binomial distribution, if the parameter x 0 {\displaystyle x_{0}} is a positive integer, the negative multinomial distribution has an urn model interpretation.
Source: Wikipedia — Negative multinomial distribution (CC BY-SA 4.0)