Найдите мнжества A и B если:
а) A U B = {3 4 5}, A ∩ B = {3,5}, B\A= ∅
b) A U B = {a,b,c}, A ∩ B = {a,b}, A\B = {c}
c) A U B = {3,4,5,6,7}, A ∩ B = {6,7}, A\B = {3,4}
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