What is the result of union(groupA, groupB)?

What is the result of union(groupA, groupB)?

• A. {3,6,8,9,10,12}
• B. {6,8,10,12,3,9}
• C. {6,12}
• D. {3,6,8,9}

Answer: (B)

Unioning two groups means taking every element that appears in either group, and removing duplicates. If you combine groupA and groupB, you end up with all the distinct elements that occur in either one. In this case, the elements involved are 3, 6, 8, 9, 10, and 12, so the union contains exactly those six numbers. The order of elements in a set isn’t important, so any representation listing those same six numbers is a correct depiction of the union. The option shown includes all six elements, just in a different order, which is why it is the correct choice.

Unioning two groups means taking every element that appears in either group, and removing duplicates. If you combine groupA and groupB, you end up with all the distinct elements that occur in either one. In this case, the elements involved are 3, 6, 8, 9, 10, and 12, so the union contains exactly those six numbers. The order of elements in a set isn’t important, so any representation listing those same six numbers is a correct depiction of the union. The option shown includes all six elements, just in a different order, which is why it is the correct choice.