26. You have two opponents with whom you alternate play. Whenever you play A, you win with...
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26. You have two opponents with whom you alternate play. Whenever you play A, you win with probability pA; whenever you play B, you win with probability pB, where pB > pA. If your objective is to minimize the expected number of games you need to play to win two in a row, should you start with A or with B?
Hint: Let E[Ni] denote the mean number of games needed if you initially play i. Derive an expression for E[NA] that involves E[NB]; write down the equivalent expression for E[NB] and then subtract.
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