Considerau el conjunt A=\{0,1,2,3,4,5,6,7,8,9\} i la familia de subconjunts ...
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Considerau el conjunt A=\{0,1,2,3,4,5,6,7,8,9\} i la familia de subconjunts X=\{\emptyset,\{0,2,4\},\{1,3,7\},\{5\}\}. Quina o quines de les afirmacions següents és vertadera?