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 union B would be when you join both the sets.

Answer 2

I'll give you an example: A = {1,2,3} and B = {4,5,6}. So A U B would be {1,2,3,4,5,6}

Answer 3

If any element is common, then you won't repeat.

Answer 4

yep combine all the elements

Answer 5

of a and b

Answer 6

A = {1,2,3} and B = {3,4,5} then A U B would be {1,2,3,4,5} but not {1,2,3,3,4,5}

Answer 7

its first or the third can you tell which one?

Answer 8

As I said, when you write a union then the elements should not repeat.