Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 48

General: Combination Lock You have a combination lock. Again, to open it you turn the dial to the right and stop at a first number, then you turn to the left and stop at a second number. Finally, you turn to the dial to the right and stop at a third number. Suppose you remember that the three members for your lock are 2, 9, and 5, but you don't remember the order in which the numbers occur. How many sequences of these three numbers arc possible