In a school of 330 students, 85 of them are in the drama club, 200 of them are in a sports team and 60 students do drama and sports.

Find the probability that a student chosen at random isn't in the drama club or in a sports team.

Let's denote students in D = in the drama club, S = in a sports team

P (D) = 85/330

P (S) = 200/330

P (D and S) = 60/300

P (D or S) = P (D) + P (S) - P (D and S) = 85/330 + 200/330 - 60/330 = 15/22

P (neither D nor S) = 1 - 15/22 = 7/22