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A = {0,1,2,3,4,5,6,7}
B = {4,5,6,7,8}
A n B = {4,5,6,7}
2.
A = {1.2.3.4.5}
B = { 2,3,5,7,11,13,17}
A U B = {1,2,3,4,5,7,11,13,17}