3. A class has 11 boys and 16 girls ... How many ways

can the teacher choose one boy and one girl?

The probability is 99/400

Step-by-step explanation:

It is given that the number of boys and girls in a class is as follows: Number of boys = 11 and Number of girls = 9. Then, the total number of students in the class = 20 students. Then, the probability of choosing a boy = number of boys divided by total number of students in the class = 11/20. Similarly, the probability of choosing the girl = number of girls divided by number of all students = 9/20 Then, the probability of choosing one girl and a boy is = 11/20 * 9/20 = 99/400