A school has five houses A, B,C,D and E. A class has 23 students, 4 from houses A, 8 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is

A school has five houses A , B , C , D and E . A class has 23 students, 4 from houses A , 8 from house B and 5 from house C , 2 from house D and rest from house E . A single student is selected at random to be the class monitor. The probability that the selected student is not from A , B and C is

A school has five houses A,B,C,D and E. A class has 23 students, 4 from house A, 8 from house B, 5 from house student is selected at random to be a class monitor. The probability that the selected student is not from A,B and C is

A class has 20 girls and 16 boys. One student is selected at random. Find the probability that the student is a girl.

A class has 15 boys and 5 girls. Suppose three students are selected at random from the class. Find the probability that they are all boys.

A class has 12 boys and 4 girls. If three students are selected at random from the class, what is the probability that all will be boys?

A class has fifteen boys and five girls. Suppose three students are selected at random from the class. The probability that there are two boys and one girl is

In a medical examination of students of a class, the following blood groups are recoreded. A student is selected at random from the class. The probability that he/she has blod group B, is

In a medical examination of students of a class, the following blood groups are recorded. A student is selected at random from the class. The probability that he/she has blood group B, is

In Class XI of a school 40 % of the students study Mathematies and Biology. If a student is selected at random from the class, find the probability that he will be studying Mathemetics or Biology.