Suppose that in a branching process the number of offspring of an initial particle has a distribution whose generating function is f .s/. Each member of the first generation has a number of offspring whose distribution has generating function g.s/. The next generation has generating function f , the next has g, and the distributions continue to alternate in this way from generation to generation.
(a) Determine the extinction probability of the process in terms of f .s/ and g.s/.
(b) Determine the mean population size at generation n.
(c) Would any of these quantities change if the process started with the g.s/ process and then continued to alternate?
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