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Andrei flips a coin over and over again until he gets a tail followed by a head, then he quits. What is the expected number of coin flips?
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An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?
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Andrei flips a coin over and over again until he gets a tail followed by a head, then he quits. What...
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