Whose book is this? Suppose that 4 friends get together to study at Leigh’s house for their next statistics test.

When they go for a snack in the kitchen, Leigh’s 3-year-old brother makes a tower using their textbooks.

Unfortunately, none of the students has written his or her name in the books, so when they leave, each student takes one of the books at random. When the students return the books at the end of the year and the clerk scans their barcodes, the students are surprised to learn that none of the 4 had their own book. What’s the probability that none of the 4 students ended up with the correct book? Design and carry out a simulation to help answer this question.