Question

Daca A={-1, 0, 1 ,2} si B={-2, -1 ,2, 5 }atunci suma elementelor multmii A∩B este egala cu ???

Answer 1

A∩B = {-1; 2}
-1+2=1
........

Answer 2

A∩B={-1,2}
-1+2=1
AUB={-2,-1,0,1,2,5}