represent A subset A union B in venn diagram
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The rectangular region represents the universal set U and the circular regions the subsets A and B. The shaded portion represents the set name below the diagram. ... Now we will use the notation A U B (which is read as 'A union B') to denote the union of set A and set B. Thus, A U B = {x : x ∈ A or x ∈ B}.
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