Question

 Fie multimile A={11,13,21,31,49,55}.B={13,31,48,55}.C={11,13,21,48}.aflati A∨B,C∧B,A∧B,C∧B,A∨C,A∨(B∨C),A∧C,A∨(B∧C) 

Answer 1

A∨B={11,13,21,31,48,49,55}
C∧B={13,48}
A∧B={13,31,55}
C∧B={13,48}
A∨C={11,13,21,31,48,49,55}
A∨(B∨C)=A∨{11,13,21,31,48,55}={11,13,21,31,48,49,55}
A∧C={11,13,21}
A∨(B∧C)=A∨(13,48}={11, 13, 21, 31, 48, 49, 55}