Kupershmidt argues for $$\mu_{K}([j]_q)\propto(pq)^j,\;\;[j]_q=\frac{q^j-1}{q-1},$$ as the "natural" $q$-geometric distribution, because it produces the $q$-analog of the Pascal (negative binomial) distribution. It has a simple normalization,
Carlo Beenakker
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