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probability generating function
<math>Var(X) = \frac{1-p}{p^2}</math>.
<math>Var(X) = \frac{1-p}{p^2}</math>.
== Probability-generating function ==
The [[probability-generating function]] <math>G_X(z)</math> is:
<math>G_X(z) = \frac{z\,p}{1-z(1-p)}</math>.