Binomial Coefficient
A combination is also called the binomial coefficient or combinatorial number. It is represented by 
and read "n over k".
Example
Properties of the Binomial Coefficient
1. 
2.
3.
Examples
1. 
For the 2nd property, there is:
2. 
For the 3rd property, there is:
x = 4
3. 
4. 
