On the venn diagram, which region(s) represent the union of set a and set b (a⋃b)?

In Venn Diagram union of set A and set b represent the all region of A and All region of B including common region of both.

Step-by-step explanation:

Union of Set A and Set B is the Set C which consists of all those elements which are either in set A or in set B ( including those which are in both ).

⇒ A ∪ B = { x : x ∈ A or x ∈ B }

So, In Venn Diagram union of set A and set b represent the all region of A and All region of B including common region of both.

Figure is attached.

18a

step-by-step explanation:

simply because it is. it's the highest common factor