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2. X={cuadrado, triángulo}, Y={círculo, elipse}; XUY = {cuadrado, triángulo, círculo, elipse}
3. D={árbol, palmera, arbusto}, E={planta, flor, fruto}; DUE={árbol, palmera, arbusto, planta, flor, fruto}
4. R={2, 4, 6, 8}, P={1, 3, 5, 7, 9}; RUP={1,2,3,4,5,6,7,8,9}
5.C={1, 3, 5, 7}, D={1, 3, 5, 7}; AUB = {1, 3, 5, 7}