Lesson 2

Lesson 2 Summary

 

In this lesson you learned how to simplify expressions involving factorial notation and how to solve equations that contained factorial expressions. You learned that permutations are questions in which order is important and that solving these questions may involve the use of factorial notation. You learned the importance of order in security measures such as codes, passwords, and some types of locks.

 

In the next lesson you will learn how to apply these skills in determining the number of permutations of n items taken r at a time. For example, this means you may have 10 items and be asked to select only 6 of those items at a time. In this lesson you selected all items each time (i.e., n items taken n at a time).