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We have an advantage if we have blood group AB. Those who have blood group AB can receive blood from a person of any blood group(A, B, O or AB).

Also those who have blood group O can donated blood to any person of any blood group.

NOTE: blood groups are also positive and negative. There cannot however be a blood transfusion between people of negative and positive blood groups.E.g.- A person with blood group AB+ can receive blood from B+ but cannot receive blood from B- or A- or O- or AB-.