Question

Considere os conjuntos A= {2,4,5,12,40,53} e B= {9,12,30,90}, determine A u B e A B

Answer 1

$\sf A=\{2,4,5,12,40,53\}~~B=\{9,12,30,90\}\\\sf A\cup B=\{2,4,5,9,12,30,40,53,90\}\\\sf A\cap B=\{12\}$