Probability, STD2 EQ-Bank 2 MC

The Venn diagram shows information about 40 students and the subjects they study.
  

One student is selected at random.

What is the probability that the student studies Art but not Music?

1. \(\dfrac{1}{8}\)
2. \(\dfrac{1}{4}\)
3. \(\dfrac{3}{8}\)
4. \(\dfrac{1}{2}\)