Check that a set does not include an element that is not in the universal set. Draw a Venn diagram for ξ = {positive whole numbers less than 10}, A = {prime numbers} and B = {even numbers}.

A Venn diagram captioned: "In a survey of 250 European travelers, 93 have traveled to Africa, 155 have traveled to Asia, and 70 have traveled to both of these continents, as illustrated in the Venn ...