#### Combinatorics

Addition and Multiplication principles

Factorials!

Permutations

Arrangements in a circle

Arrangements from like objects

Addition and multiplication principles revision

Factorials and permutations revision

Permutations of like objects

Permutations with restrictions

Combinations

Combinations with restrictions

Pascals triangle and subsets of a set

Pigeonhole principle

Basic Set Theory

The inclusion exclusion principle for 2 and 3 sets

#### Vectors in the Plane

Vectors Introduction

Adding Vectors Graphically

Vectors Multiplying by a scalar