In a race where 10 cars are running, the chance that car X will win is 1/7, that Y will win is 1/3 and that Z will win is 1/5. Assuming that a dead heat is impossible, find the chance that one of them will win. Choose the correct option
A) 1/140	B) 1/180	C) 71/105	D) 21/113	E) 57/120
Required probability = P(X) + P(Y) + P(Z) (all the events are mutually exclusive).   = 1/7 + 1/3 + 1/5   = 71/105   ANSWER:71/105
<result>C</result>
In a race where 10 cars are running, the chance that car X will win is 1/7, that Y will win is 1/3 and that Z will win is 1/5. Assuming that a dead heat is impossible, find the chance that one of them will win.