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Problem 4


In the game roulette, there are 18 red numbers, 18 black numbers, and two green numbers.  They are all equally likely.  If a person makes a $5 bet on red and a red number comes out, he/she will make a $5 profit.  If another color comes out, the person will lose his original $5 bet.  What is the expected value for this bet?    


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