A Sequence is a set of things (usually numbers) that are in order. If the sequence goes on forever it is called an infinite sequence, otherwise it is a finite sequence. For example:

{1, 2, 3, 4 ,...} is a very simple sequence (and it is an infinite sequence)

{20, 25, 30, 35, ...} is also an infinite sequence

{1, 2, 4, 8, 16, 32, ...} is an infinite sequence where every term doubles

{a, b, c, d, e} is the sequence of the first 5 letters alphabetically.

- Finite Sequences
- Infinite Sequences
- Geometric Sequences
- Arithmetic Sequences
- Fibonacci Sequences

Series give us one of the most common ways of getting sequences. When the terms of a sequence are added, we get a series.

The sequence 1, 4, 9, 16, 25 . . . .

Gives the series 1+4+19+25+. . . .

Sigma notation for a series:

A series can be described using the general term. For example 1 + 4 + 9 + 25 + . . . . . . . .100 Can be written ∑_{1}^{10}n^{2} where 10 is the last value of 'n' and the 1 is the first value of 'n'.

1. nth term of an arithmetic sequence: a^{n} = a_{1} + (n-1)d

2. Sum of arithmetic series: s_{n} = n/2(a_{1}+a_{n})

3. Sum of arithmetic series: s_{n} = n/2(2a_{1} + (n-1)d)

4. nth term of geometric sequence: a_{n} = a_{1}r^{n-1}

5. nth term of geometric sequence: a_{n} = a_{n-1}r

6. Sum of geometric series: s_{n} = a_{1}(1-r^{n})/1-r

7. Sum of geometric series: s_{n} = a_{1} - a_{1}r^{n}/1-r

8. Sum of geometric series: s_{n} = a_{1} - a_{n}r/1-r

9. Sum of infinite geometric series: s = a1/1-r

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