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A jar holds three balls marked +$1 and two marked -$1. You draw without replacement, collect each amount and may stop at any time. What is the fair price of the game?

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A bag holds 10 red, 10 yellow and 10 blue balls. You draw three balls without replacement. What is the probability that the three balls are all of different colours?A bag holds r red and w white balls. You draw without replacement until only one colour remains. What is the probability that the white balls run out first?Cards 1 to 9 are shuffled and turned over one at a time. Stop when you like and collect the sum of the latest decreasing run. What is the fair price of the game?

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