
A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, A, AB,
O, A, A, O, O, AB, B, A, O, B, A, B, O
Solution:
Numbers of students 30
Numbers of students having blood group AB = 3
The probability that a student of this class, selected at
random, has blood group AB