There are 1000 students in a high school. Among the 1000 students, 150 students take AP Statistics, and 300 students take AP French. 100 students take both AP courses. Let S be the event that a randomly selected student takes AP Statistics, and F be the event that a randomly selected student takes AP French.
(a) Provide a written description of the complement event of (S OR F).
(b) What is the probability of complement event of (S OR F)?