Question: . Twenty persons reporting to a Red Cross center one day are typed for blood, and the following counts are found Blood group O A

. Twenty 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 Total

No. of persons 8 4 5 3 20

If one person is randomly selected, what is the probability that this person's blood group is: (a) AB? (b) Either A or B? (c) A and B? (d) Not O? (e) A given that his/her blood is Not O?

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