17 teachers are neither married nor have their spouses not in the school
Venn diagram
A Venn diagram is an illustration that uses circles to show the relationships among things or finite groups of things.
Venn diagrams help to visually represent the similarities and differences between two concepts.
From the question:
Number of teachers neither married nor have their spouses not in the school = 38 - (15 + 6) = 17
Find out more on venn diagram at: https://brainly.com/question/1024798