A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive , and O positive. The blood group of the adopted son is ? 

(a) O positive 

(b) A positive 

(c) B positive 

(d) Cannot be determined on the basis of the given data


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(a) The blood group of the parents are AB and O; the child’s blood group may be A or B and since the boy is adopted and it is given in the question that “ the blood group of the three sons are A+, B+, O+”.

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