1. Lesson 2

1.8. Explore 4

Mathematics 30-2 Module 3

Module 3: Permutations, Combinations, and the Fundamental Counting Principle

 

In Try This 4, you practised expanding a factorial expression that included the variable n. The ability to expand factorial expressions helps to simply expressions.

 

Simplify

 

Expand both the numerator and denominator.

 

 

 

The only factor that did not divide out of the numerator and denominator was the n.



textbook

Read “Example 3” on page 79 of your textbook. Notice how the product in part a can be simplified as a single factorial expression.

 

 

Self-Check 3
  1. Do “Your Turn” on page 79 of your textbook. Answer
  2. Simplify Answer