1. Algebra

2. Factorials are noted by the expression n! and reads “n factorial”

3. Examples

6. The binomial coefficient is defined as and it reads as “n chooses r” is the number of ways of choosing ‘r’ objects from ‘n’ objects

7. How many ways are there choosing 3 people from 5? abc abd abe acd ace ade bcd bce bde cde A total of 10 different ways

8. For the last example we can use a calculator Type in the following sequence Your answer will also be equal to 10

9. Examples

11. Other important properties

14. Summarize

15. Find the value of ‘n’ for

16. since only positive answers are permitted,