Question

Venn diagram was introduce by_______ in the year ________.

Answer 1

Answer:

The English logician John Venn popularized the diagram in the 1880s. He called them Eulerian circles after the Swiss mathematician Leonard Euler, who created similar diagrams in the 1700s.

Answer 2

Venn diagram was introduced by $\rm\underline\pink{ John \: \: Venn }$ in the year $\sf\underline\green{ 1880s }$