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20-sided die, 100 rounds: each round either roll, or take the face value in dollars, after which the die is removed until you spend a round rolling again. How should you play?

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A casino game uses a 20-sided die with faces numbered 1 to 20. At the start the die is on the table showing 1. You have 100 rounds. In each round you either roll the die, which pays nothing, or take from the casino a number of dollars equal to the face showing. Taking the money also takes the die off the table, so you must spend a round rolling it again before you can take money again. How would you play to maximise your earnings, and how does this differ from the version in which the die stays on the table after you take money?

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