Sequences and Series
Formulae
Formulae in Log tables p.23
Videos
Introduction to Patterns and Sequences
Arithmetic Sequence
Arithmetic Series
Geometric Sequence
Geometric Series
Number Patterns
10 more revision questions with worked solutions

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Khan Academy Interactive Exercises on Sequences and Series
Note the notation is slightly different than in the Irish system.
- For term they use "a" in place of "T" or "U".
- For the term number they use "i" in place of "n".