There are 20 male students and 25 female students in a class. How many different pairs consisting of one boy and one girl can be formed?

Explanation

One boy can be chosen from 20 boys in 20 different ways. Similarly, one girl can be selected from 25 girls in 25 ways. Therefore, the total number of ways to select one boy and one girl is 20 multiplied by 25, which equals 500.