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There r four types of blood groups- 1.A 2.B 3.AB 4.O Since A has antibodies of B thus its donor grp are A& O B has antibodies of A thus its donor grps are B& O AB has no antibodies thus its donor grps are A, B, O. And thats y it is known as a universal acceptor O has antibodies of A, B thus its donor grp is O itself since it only donates not accepts frm any other grp thus it is known as universal donor. Hope u got ur ans