Algebra
Factorials are noted by the expression n! and reads “n factorial”
Examples
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
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
For the last example we can use a calculator Type in the following sequence Your answer will also be equal to 10
Examples
Other important properties
Summarize
Find the value of ‘n’ for
since only positive answers are permitted,