| Summary: | The first part of this lesson introduces & works with factorial notation by simplifying expressions & eventually solving equations with factorials.
The second part of this lesson deals with the definition of a permutation & the formula for a permutation. Questions are done where there are no restrictions.
After this lesson, you will be able to:
- understand the definition and terminology of a permutation
n P r
- understand factorial notation
 and the definition of 
- work with the formula for a permutation
when there are no restrictions.
- answer questions using factorial notation.
- use the permutation formula to answer word problems without restrictions
- solve equations using the permutation formula,
for example 
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