In a class of 50 students, 31 are Democrats, 13 are business majors, and 3 of the business majors are Democrats. If one student is randomly selected from the class, find the probability of choosing a Democrat or a business major.

Answer 1

31 + 13 + 3 ≠ 50

What about the remaining 3 students?

13/50 = business major

31/50 = Democrats

Either-or probabilities are found by adding probabilities of individual events.