One option in a roulette game is to bet $21 on red. ​ (There are 18 red​ compartments, 18 black​ compartments, and two compartments that are neither red nor​ black.) If the ball lands on​ red, you get to keep the $21 you paid to play the game and you are awarded $21.If the ball lands​ elsewhere, you are awarded nothing and the $21 that you bet is collected. Find the expected payback for this roulette game if you bet $21 on red.

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