Learning Resources

Outcomes

In this lesson you will

• Discover that the number of combinations obtained when r items are taken from a total of n items is a subset of the number of permutations of the same set.
• Explore a formula for calculating the number of combinations obtained when r items are taken from a total of n items

By the end of this section you should be able to:

• Develop an understanding of factorial notation and apply it to calculating permutations and combinations.
• Distinguish between situations that involve combinations and permutations.
• Develop and apply formulae to evaluate permutations and combinations.

Prerequisites

To be successful in this lesson, it would be helpful to know the following:

• Factorial notation and how to work with it.
• How to calculate permutations.