The union of sets A and B, written as A ∪ B, is the set of elements that are members of A, or members of B, or members of both A and B. Example: 1. If A = {1, 2, 3} and B = {1, 2, 4, 5, 6}, then A ∪ B = {1, 2, 3, 4, 5, 6} 2. If A = {a, b, c, d, e} and B = {a, e, i, o, u}, then A ∪ B = {a, b, c, d, e, i, o, u} 3. If A = {Monday, Tuesday, Wednesday, Thursday, Friday} and B = {Saturday, Sunday}, then A∪B = {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}

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