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12/10/2021 8:22 pm
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A person with unknown blood group under ABO system has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type offers blood donation without delay. What would have been the type of blood group of the donor friend?
(1) Type O
(2) Type B
(3) Type A
(4) Type AB
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12/10/2021 8:22 pm
Correct answer: (1) Type O