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<tex dpi = "160"> = p\frac{\operatorname{d}^{2}}{\operatorname{d}p^{2}}\left(\frac{(1-p)^2}{p}\right) +p\frac{\operatorname{d}}{\operatorname{d}p}\left(\frac{1-p}{p}\right) =</tex>
<tex dpi = "160"> = p\cdot\frac{2}{p^3} - p\cdot\frac{1}{p^2} = \frac{2}{p^{2}} - \frac{1}{p} = \frac{12-p}{p^{2}}</tex>.
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