Concept

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Sequences and Series
Arithmetic and Geometric Sequences
A tutorial on topics from sequences and series.  Topics include explanations and problems on arithmetic and geometric sequences, summation notation and some common formulae for sequences and series.

mathsnet.net 

Recurrence Relations
A brief introduction and some examples of recurrence relations

Binomial Expansion and Binomial Series
The binomial expansion is given and explained.  Problems involving its use are solved in detail. See below for info on notation.
 

mathsnet.net   or this link

Summation Notation

mathsnet.net

Factorial Notation

C(n, r) notation
 

mathsnet.net