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Se dau multimile:
A={x/x ∈ N, x ≤ 6}
B={ x/x ∈ N, 5< x< 7}
C={x/x ∈ N, 3< x< 7}
aflati cardinalul multimilor: (B/A) U (C/B), (A un u intors semnul de intersectie)/(B U C)