Conditioned branching process. Consider a branching process whose family sizes have the geometric mass function f(k)= qpk, k ≥ 0, where μ = p/q > 1. Let Zn be the size of the nth generation, and assume Zo= 1. Show that the conditional distribution of Zn/un, given that Zn > 0, converges as n → ∞ to the exponential distribution with parameter 1 - μ-¹.
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