Question

اذا كانت   A equals open curly brackets space 1 space comma space space 2 space comma space 3 space comma space 4 space close curly brackets space space space comma space space B equals open curly brackets space 3 space comma space 5 space close curly brackets  فان   B union A equals
open curly brackets space 1 space comma space space 2 space comma space 3 space comma space 4 space close curly brackets
open curly brackets space 1 space comma space space 2 space comma space 3 space comma space 4 space comma space 5 close curly brackets
open curly brackets space 3 space comma space 5 space close curly brackets
right to left empty set

Answer 1

{1, 2, 3, 4, 5}