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12, Se considera multimile a= (2,3,5,6,8)
B=(0,1,2,3) si C=(0,3,4,7,9)
a) Reprezentati prin diagrame cele 3 multimi
b) Efectuati A∪B∪C, B-C, (B∪C ) - A, A ∩B, C∩ N