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+ and O-. The blood groups of the three sons is A+, B+ and o-. The blood group of the adopted son is

Options :
  1. o+
  2. A+
  3. B+
  4. can not be determined on the basis of the given data
Answer and Explanation :-

Answer: Option 4


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