Changes

== Probability-generating function ==

== Probability-generating function ==

The [[probability-generating function]] <math>G_X(z)</math> is:

The [[probability-generating function]] <math>G_X(z) = \sum_{n=0}^\infty z^n \cdot \mathbf{P}[X=n]</math> is:

<math>G_X(z) = \frac{z\,p}{1-z(1-p)}</math>.

<math>G_X(z) = \frac{z\,p}{1-z(1-p)}</math>.