There are 2000 students in a high school. Among the 2000 students, 1500 students have a laptop, and 900 students have a tablet. 500 students have a laptop and a tablet. Let L be the event that a randomly selected student has a laptop, and T be the event that a randomly selected student has a tablet. (Show all work. Just the answer, without supporting work, will receive no credit.)

(a) Provide a written description of the complement event of (L OR T).

(b) What is the probability of complement event of (L OR T)?