Jack and Jill Fertile have 2 children of different ages. Assume the probability of a boy (or girl) is 0.5. We are interested in the birth hour, numbered from 0 to 23. The birth hour is computed by noting the (military) time hour digits (there is no rounding). Further suppose that a child is equally likely to be born at a given birth hour. Now suppose you are told that the Fertiles have a girl with birth hour 11. What is the probability that the oldest child is a girl?

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