Problem
Fifteen persons reporting to a Red Cross center one day are typed for blood, and the following counts are found:
|
Blood group
|
O
|
A
|
B
|
AB
|
|
No.of persons
|
3
|
5
|
6
|
1
|
If one person is randomly selected, what is the probability that this person's blood group is: AB? Give exact answer in terms of fractions.