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A roulette wheel consists of 38 slots. 36 of these are numbered 1 through 36 and colored red or black so that there are nine red even-numbered slots, nine black odd-numbered slots, etc. These slots occurs with equal probability. The two slots marked 0 or 00 are each three times as likely to occur as any one the other 36. What is the pprobablitliy that a red even number, a red 23, or a 00 will occur on one roll of the wheel?
A. 2/7
B. 5/18
C. 13/38
D. 13/42
E. 3/10
The correct answer is D. I worked it out like so and got C.
9/38 (chance of red even number) + 1/38 (chance of red 23) + 3/38 (chance of 00) = 13/38.
Probably some silly mistake. Help, please.
A. 2/7
B. 5/18
C. 13/38
D. 13/42
E. 3/10
The correct answer is D. I worked it out like so and got C.
9/38 (chance of red even number) + 1/38 (chance of red 23) + 3/38 (chance of 00) = 13/38.
Probably some silly mistake. Help, please.