In a class of 36 student 25 study chemistry 22 study mathematics and 25 study physics. 17study physics and mathematics,18 study physics and chemistry and 15 study only one of the three subject.

a) Illustrate the information on the venn diagram

Unfortunately, as an AI language model, I do not have the capability to draw diagrams. However, I can describe the information on the Venn diagram:

There are three overlapping circles representing the three subjects - chemistry, mathematics, and physics. The circle for chemistry has 25 students, the circle for mathematics has 22 students, and the circle for physics has 25 students.

There are also areas representing the different combinations of subjects. The intersection of chemistry and mathematics has 17 students, the intersection of physics and mathematics has 18 students, and the intersection of physics and chemistry has an unknown number of students.

Additionally, there is an area outside of all three circles representing the students who only study one of the three subjects, with a total of 15 students.