User:Temperal/The Problem Solver's Resource5
This section cover combinatorics, and some binomial/multinomial facts.
The factorial of a number is or also as ,and is denoted by .
The number of ways of arranging distinct objects in a straight line is . This is also known as a permutation, and can be notated
The number of ways of choosing objects from a set of objects is , which is notated as either or . (The latter notation is also known as taking the binomial coefficient.
Binomials and Multinomials