In a race where 16 cars are running, the chance that car X will win is 1/4, that Y will win is 1/12 and that Z will win is 1/7. Assuming that a dead heat is impossible, find the chance that one of them will win.
Choose one.
A) 1/140 B) 10/21 C) 27/410 D) 11/21 E) 57/120
Required probability = P(X) + P(Y) + P(Z) (all the events are mutually exclusive).   = 1/4 + 1/12 + 1/7   = 10/21   ANSWER:10/21
<result>B</result>
In a race where 16 cars are running, the chance that car X will win is 1/4, that Y will win is 1/12 and that Z will win is 1/7. Assuming that a dead heat is impossible, find the chance that one of them will win.