Show that the adjustment coefficient is log32 if un


You are repeatedly playing a game in which at each stage you win 1 with probability 15/19 or lose 2 with probability 4/19.

(a) Show that the adjustment coefficient is log(3/2).

(b) If Un denotes the amount you have at time n, show that Un is not a martingale.

(c) At time 20 you have a total of 4 units. What is E((2/3)U50 )?

(d) Suppose you start with 3 units at time 0. You decide to stop play when you have a total of 20 units, or after 100 plays if that occurs earlier. If US is the amount that you will have after stopping play, what is E((2/3)US )?

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Mathematics: Show that the adjustment coefficient is log32 if un
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