Venn diagrams are used to sort sets of data. The probability of an event not happening uses the complement of the region on the Venn diagram. Count the number of elements in each region. Redraw ...

John Venn is most known for creating and introducing the Venn diagram in 1880, which has been used in the fields of set theory, probability, logic, statistics, and computer science according to ...

John Venn: The man behind the famous diagrams – and why his work still matters today One of Venn’s major achievements was to find a way to visualise a mathematical area called set theory.