Question

In a certain Algebra 2 class of 27 students, 6 of them play basketball and 5 of them play baseball. There are 2 students who play both sports. What is the probability that a student chosen randomly from the class plays basketball or baseball?

Answer 1

Number who play at least one = 6 + 5 − 2 = 9 (use inclusion–exclusion).
Probability = 9/27 = 1/3 ≈ 0.333.