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B = {1, 3, 6, 7 }
C = {7, 9 }
1) A∪B = {1, 2, 3, 5, 6, 7}
2) A ∪ B∪ C = (1,2,3,5,6,7,9 }
3) A∩ (B∪C) = {(2,3,5) ∩ (1,3,6,7,9} = {3}
4) (A∩B) ∪ C = {1,2,3,5,6,7} ∪(7,9) = {1,2,3,5,6,7,9}
5) (A∪B) ∩ (A∪C) = {1,2,3,5,6,7} ∩ {2,3,5,7,9} = {2,3,5,7}