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A player in D&D want to roll a critical hit on her 20-sided dice (this means she rolls a 20). If she has a fair

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A player in D&D want to roll a critical hit on her 20-sided dice (this means she rolls a 20). If she has a fair die, what is the expected number of rolls before she rolls a 20. 1/20 O 19/20 20 O 19

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