Easy probability question: For 5 stars and good tutor review please explain each step by showing working out and conclude with analysis.

Certain cells are buried in plasma in blood. Blood contains protein molecules called antigens and antibodies, which vary across individuals and combining them is harmful. 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. Clumped red blood cells may cause harmful responses with cracking. Similarly, B antigens and antibodies pose a risk. Consider a red blood cell transfusion. A and B antibodies in blood type A B antigens 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: 40 % B: 11 % AB: 4 % 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 acceptable 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 serious consequences after a red blood cell transfusion depending on blood type and Rh factor mixing.