Re: a little help with this probability problem
The second one is less work than the first, since it's just asking how often A will win 1/2 or more of the games, but AFAIK there's no closed form for it. You have to take the sum of the first k/2 terms of the binomial expansion of (X+Y)^k.
For the first question, you can generate the probabilities for A and B to win exact numbers of games, and then do summations.
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