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B = {6,7,8,9, 10,...}
La union de A y B es = U - 5 porque 5 no esta en A ni en B
(A U B) = {U - 5}
(A – B) = {1,2,3,4} = A
La interseccion entre U y A es A
(A U B) ∩ (A – B) = A
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