Easy probability question:

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Antigens are found on red blood cell surfaces, whereas antibodies are found in blood plasma. A dangerous situation arises when the A antigen and A antibodies interact. This clumping may kill you . Clumped red blood cells may cause harmful responses with cracking.

Similarly, B antigens and antibodies pose a risk. Consider a red blood cell transfusion. Blood group A: A and B antibodies Blood group B: B and A antibodies Blood group AB: A and B antigens, no antibodies Blood group O: A and B antibodies, no antigens Percentage of types A, B, AB, and O: 45% A: 45 % B: 12 % AB: 2 % Another protein on red blood cells identifies the Rh factor. Rh+ people carry this protein. Lacking this protein makes you Rh-. About 85% of people are Rh+ and 15% are Rh-. Rh- can give blood to anyone, whereas Rh+ should not. It's OK to exchange Rh+ and Rh-. Consider a red blood cell transfusion between two randomly selected individuals without assessing blood type, blood group, or Rh factor. Determine the probability of a major consequence after a red blood cell transfusion depending on blood type and Rh factor mixing.