Question

In a class of 28 students, 19 have a brother and 8 have a sister. There are 5 students who have a brother and a sister. What is the probability that a student chosen randomly from the class does not have a brother?

Answer 1

Explanation:

See Venn diagram below

Does not have a brother = 3 + 6 = 9 students out of 28 = 9/28