In set notation this is B = {1, 4, 9}. 30 people answered a survey about whether they have a dog or a cat. The Venn diagram shows the information from the survey. 13 people have got a dog.

I think we should start a Cats of Jeopardy thread because I’m convinced the Venn diagram of Jeopardy lovers and cat lovers is close to a perfect circle.” Joey DeSena, Champion Wildcard ...