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In one version of​ roulette, a wheel has 18 black​ slots, 18 red slots and 2...

In one version of​ roulette, a wheel has 18 black​ slots, 18 red slots and 2 green slots. All slots are the same size. A player can place a bet on either red or black. Green is reserved for the house. If a player places a bet of​ $5 on either red or black and that color comes​ up, they win​ $10. Otherwise, the casino takes the​ player's $5. What is the expected value of playing the game​ once?

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