Question

Fie multimile : A= {x∈N* x ≤ 4}; B={x∈ N 2≤ x ≤ 3}; C={x ∈ N* 3x + 1 ≤ 10}
a) enumerati elementele multimilor A,B,C
b) calculati: A reunit B ; B reunit c ; A reunit C ; A intersectat B ; A intersectat C ;
B intersectat C ; A - B ; B - A ; A - C ; C - A ; B - C ; C - B ; (A reunit B) intersectat C ,
(A intersectat B) reunit C , (A - B) reunit C , (A - B) reuit (B - A) , A reunit B reunit C ,
A intersectat B intersectat C , (A - B) intersectat C , (A reunit B) - C , (A intersectat B) - A
(A - C) intersectat (C - A).

Answer 1

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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