In a race where 8 cars are running, the chance that car X will win is 1/2, that Y will win is 1/4 and that Z will win is 1/3. Assuming that a dead heat is impossible, find the chance that one of them will win.
Choose the correct choice from the following answers.
A) 1 / 140	B) 11 / 12	C) 14 / 8	D) 13 / 12	E) 57 / 120

Rationale: required probability = p ( x ) + p ( y ) + p ( z ) ( all the events are mutually exclusive ) . = 1 / 2 + 1 / 4 + 1 / 3 = 13 / 12 answer : d
Answer: D