If you bet on red, you win if the ball lands in a "red" slot. What is the probability of winning?

A roulette wheel has 38 slots, numbered 0, 00, and 1 to 36. The slots 0 and 00 are colored green, 18 of the others are red, and 18 are black. The dealer spins the wheel and at the same time rolls a small ball along the wheel in the opposite direction. The wheel is carefully balanced, so that the ball is equally likely to land in any slot when the wheel slows down. Gamblers can bet on various combinations of numbers and colors.

If you bet on red, you win if the ball lands in a "red" slot. What is the probability of winning?




A. 18/38
B. 18/36
C. 20/38
D. 2/36


Answer: A. 18/38


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