Question on Probability of Students in a Class Room Under Different Contraints

Topic : Probability

Question : In a class of 72 students, 44 are girls and,of these, 12 are going to college. Of the 28 boys in the class, 9 are going to college. If a student is selected at random from the class, what is the possibility that the person chosen is going to college.

Solution :
12 girls college
9 girls college
No of students in a class = 72
Total number of students going to college = 12+9=21
probability that the student go to college = 21/72 = 7/24