Sacco and Rosen are among three candidates running for public office, and polls indicate that the probability

Question:

Sacco and Rosen are among three candidates running for public office, and polls indicate that the probability that Sacco will win is 1 3 and the probability that Rosen will win is 1 2. Only one candidate can win.
(a) What is the probability that Sacco or Rosen will win?
(b) What is the probability that neither Sacco nor Rosen will win?