Question

If A = {1, 2, 3, 4, 5} and B = {3, 6, 9, 12, 15}, what is A union B?

{1, 2, 3, 4, 5, 6, 9, 12, 15}

{3}

{1, 2, 3, 3, 4, 5, 6, 9, 12, 15}

{ }

Answer 1

A U B means all terms b/w these.

Answer 2

These as in A and B.

Answer 3

So it's A.