Probability: Soccer Team or Chess Club

In a class, there are 20 students. Each student is either part of the soccer team, the chess club, or both. It is known that:

10 students are on the soccer team.

8 students are in the chess club.

4 students are on both the soccer team and the chess club.

If a student is chosen at random, what is the probability that this student is either on the soccer team or in the chess club?