Venn diagrams get tricky when they include more than three sets – here, a fourth set has to be stretched across the other three. (Image: Kopophex/Wikimedia Commons) The stretching method starts ...

During a recent interview with Chrissy Teigen, Vice President Kamala Harris said, “I’m going to confess, I love Venn diagrams ... mathematical reasoning and operations and representing ...

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.