Questionsgeometry

In a math class with 20 students, a test was given the same day that an assignment was due. There were 11 students who passed the test and 15 students who completed the assignment. There were 9 students who passed the test and also completed the assignment. What is the probability that a student chosen randomly from the class failed the test and did not complete the

If you fill in your Venn diagram, you will see that 3 students neither passed nor completed.

So, P(neither) = 3/20