Let (0, F, P) be a probability space, and X (w), Y (w), and Z (w) be random variables mapping to the measurable space (Zzo, 2420). Define Mz as the counting measure on Z. . We say that X : 0 -> {0, ..., N} is binomial distributed, if Px 0. . We say that Z : 2 - Zzo is negative binomial distributed, if Pz