In a group of 120 people,90 of them are 30 years old or older. everyone else in the group is younger than 20 years old. if a person is selected at random, what is the probability the person is less than 20 years old

Given a = {(1, , 5)(6,4)}, b = {(2,0)(4, ,5)(0, 0)) and c = {(1, 1)(0, 2)(0, 3)(0, ,5)}, answer the following multiple choice question: from the list of sets a, b, and c, state the domain of set b. domain of set b: {0, 6,5} domain of set b: {2, 4,-4, 0} set b does not have a domain