Make sure that the number of elements in the Venn diagram is equal to the number of elements in the universal set. Check that a set does not include an element that is not in the universal set.

We write it as \({A}\cap{B}\). In the example above \({A}\cap{B}\) = {6, 7, 9, 12}. The union of a Venn diagram is the numbers that are in either Set A or Set B. The union of the above example is ...