Hilton Mcfarlane
01/04/2023 · Senior High School
Two players, A and B , alternately and independently flip a coin and the first player to obtain a head wins. Assume player A flips first. (a) If the coin is fair, what is the probability that A wins? (b) Suppose that \( \mathrm{P}(\mathrm{head})=\mathrm{p} \), not necessarily \( 1 / 2 \). What is the probability that A wins? (c) Show that for all \( \mathrm{p}, 0<\mathrm{p}<1, \mathrm{P}(\mathrm{A} \) wins) \( >1 / 2 \) (Hint: Try to write \( \mathrm{P}(\mathrm{A} \) wins) in terms of the events \( \mathrm{E} 1, \mathrm{E} 2 \ldots, \ldots \) where \( \mathrm{Ei}= \) \{head first appears on ith toss \( \}) \)
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(a) The probability that A wins when the coin is fair is \( \frac{2}{3} \).
(b) The probability that A wins when the probability of getting a head is \( p \) is \( \frac{1}{2 - p} \).
(c) For all \( p, 0 < p < 1, P(A \text{ wins}) > \frac{1}{2} \).
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