A person with unknown blood groupunder ABO system - has suffered muchblood loss in an accident and needsimmediate blood transfusion. His onefriend who has a valid certificate of hisown blood type offers blood donationwithout delay. What would have beenthe type of blood group of the donorfriend? [2011]

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A person with unknown blood groupunder ABO system - has suffered muchblood loss in an accident and needsimmediate blood transfusion. His onefriend who has a valid certificate of hisown blood type offers blood donationwithout delay. What would have beenthe type of blood group of the donorfriend? [2011]