math
posted by Zach on .
A roulette wheel has 18 red slots and 18 black slots numbered alternaetly with the numbers 1 through 36. Two green slots are numbered 0 and 00. The winning number is determined by the slot into which a single marble rolls. Players are not allowed to bet on green. The house wins all bets if 0 and 00 comes up. What are the odds against a black number winning? a. 10:9, b. 9:10, c. 1:1, d. 19:9

Including 0 and 00, there are 38 possibilities.
1  18/38 = 20/38 = 10/19
It doesn't seem to fit any of your alternatives. Do you or your text have a typo? If a was 10:19, it would be right.