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Hello there, you just need to enter how many elements are present in the union (AUB). You don't need to list out all. That's the catch :)
Hope this helps!
How can I recommend this to folks who want to learn SQL if the mathmatical operators aren't defined before questions are asked about them. It's pretty hard to google set union if you've never seen it before... I'd love some more explanation for the math.
The union of two sets A and B is a set of elements which are in A, B or in both A and B
in this cases the refers to how many, totally of elements, one or two or three, etc..
they have just asked to specify the number of elements in aUb.....which is 8......aUb means all elements in a and b without repetetion.