Question
Roulette. A roulette wheel has 38 slots, numbered 0, 00, and 1 to 36. The slots 0 and 00 are colored green, 18 of the
Roulette. 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. Gamblers can bet on various combinations of numbers and colors.
(a) What is the probability that the ball will land in any one slot?
(b) If you bet on "red," you win if the ball lands in a red slot. What is the probability of winning?
(c) The slot numbers are laid out on a board on which gamblers place their bets. One column of numbers on
the board contains all multiples of 3, that is, 3, 6, 9, . . . , 36. You place a "column bet" that wins if any of
these numbers comes up. What is your probability of winning?
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