Save guides, add subjects and pick up where you left off with your BBC account. A Venn diagram can show data sets such as preferences in market research. When sets intersect (overlap), the ...

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 ...