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標題:

Statistics Problem #2

發問:

Three people toss a fair coin and the odd man pays for coffee. If the coins all turn up the same, they are tossed again. Find the probability that fewer than 4 tosses are needed.

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最佳解答:

In each game, the probability that no people needs to pay for coffee if and only if the result is either HHH or TTT with probability 1/4. Let X be the no. of games. Then X ~ Geo(3/4) P(X
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