My question is why can't blood group A donet blood group B

Answers (1)

The person with the blood group A will have antigen A and antibody b. The person can donate blood to the persons having the blood group A or AB. 
He can receive blood from A or O blood group. The donation and the receiving of the blood groups are decided with the compatibility of the antigens and the antibodies so that they do not react and cause coagulation.

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