Question

At Lincoln High​ School, 6 students are members of both the Chess Club and the Math Club. There are 20 students in the Math​ Club, 12 students in the Chess​ Club, and 400 students in the entire school. Find the probability that a student chosen at random belongs to the Chess Club or the Math Club

Answer 1

P(C or M) = P(C) + P(M) - P(C and M)

= 12/400 + 20/400 - 6/400

= 26/400 or 0.065

The answer is: P(C or M) = 0.065

Hope this helps.
:)