
Read pages 2628 Examples 2 and 3 in your textbook, Principles of Mathematics 12 . Complete the Your Turn question on page 27 and page 28 for more practice in determining the number of elements in a set. Click here to verify your answers . 
A frequent task in Math 302 is to analyze the solution to a given problem, determine if the solution contains any mistakes, and identify the mistakes. The next example shows a type of mistake you might be asked to identify when dealing with the intersection and union of sets.
Charles' answer is not correct. Some students take a bus but do not drive a car. These regions should overlap only partially. Because Charles drew B as a subset of C , the total number of students in Charles' diagram is only 43. An accurate diagram to represent this data is shown below.
