Question

what the union in algerba

Answer 1

if you have two sets A = {1, 2, 3} and B = {3, 4, 5}

the union of those two sets will be A U B = {1, 2, 3, 4, 5}

You basically combine sets A and B to form one big set and you toss out duplicates

Answer 2

Visually you can represent this with a venn diagram

Answer 3

set A is this circle