a) A={1,2.3.4} , B={2,3} , C={3}
b) AuB={1,2,3,4} , AuC={1,2,3,4} , BuC={2,3} , AnB={2,3} , AnC={3} , BnC={3} , A-B={1,4} , B-A=multimea vida , A-C={1,2,4} , C-A=multimea vida , B-C={2} , C-B=multimea vida , (AuB)nC={3} , (AnB)uC={3} , (A-B)uC={1,3,4} , (A-B)u(B-A)=habar n.am asta , AuBuC={1,2,3,4} , AnBnC={2,3} , (A-B)nC=multime vida presupun , (AuB)-C={1,2,4} , (AnB)-A=multimea vida cred , (A-C)n(C-A)={1,2,4}.
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