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Basics

One of the main things about statistics is the sum denoted by the greek letter sigma. A sum is simply the sum of all the values in a series between any 2 points in the function.

Combinatorics

A factorial can be defined as all whole numbers smaller multiplied together, for example 4!(the ! represents factorial) would equal 1 * 2 * 3 * 4, likewise 8! would equal 1 * 2 * 3 * 4 * 5 * 6 * 7 * 8.
1! 1
2! 2
3! 6
4! 24
5! 120
6! 720
7! 5040
8! 40320
9! 362880
10! 3628800
Using this we can define 2 new functions, combinations and permutations.
Combinations definition

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