Explanation:
Start by writing out set A = {6,7,8,9,10,11,12}
Then introduce items from set B that aren't already in set A. So you'll introduce 14 and 16 to get the answer shown above. The answer represents all the numbers that are in set A or set B or in both sets.
A slightly similar approach is to write all of the given numbers in one big set like so
{6,7,8,9,10,11,12, 8,10,12,14,16}
then we erase the duplicates 8,10,12 to get the answer above.
When dealing with sets, we only have one unique item at a time.
We can replace the "OR" in "A OR B" with the union symbol. So we could write A U B
