Here, ” A” is used as the variable for the calculation to represent your winnings in roulette from red that takes the value of 2€. If you bet 2€ on red, but the ball lands on green or black, you will lose your bet (-2). If you bet 1€ on red, and the ball lands on red, you will win it back, and the amount is doubled, so you profit 1€. The black or green spaces equal 20, so the probability that the ball will not land on red is 20/37.There are 18 red spaces 18, so the chance of a ball landing on a red is 18/37.Since there are 37 spaces, the probability of a ball landing on one of them is 1/37.
These are the values that need to be calculated:
