Question

Perform the given set operation. Let
U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}.
please solve this:

{x | x is a multiple of 2} ∪ {x is a multiple of 7}

Answer 1

{2,4,6,8,10} ∪ {7}

Answer 2

does this mean this is a empty ?

Answer 3

or does the braces union each other so it would be {2,4,6,7,8,10}?