# Sequences and series

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- Created by: harrietwilliams
- Created on: 19-04-15 18:06

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- Sequences and series
- Arithmetic sequences
- find the next term by adding a common difference
- to find a term:
- a1 + (n-1)d

- the sum to n terms:
- n/2 (2a+(n-1)d)

- Geometric sequences
- find the next term by multiplying by a common ratio
- nth term:
- ar^n-1

- sum of the series:
- a(1-r^n/1-r)

- sum to infinity:
- a/(1-r)

- Bionomial expansion

- Arithmetic sequences
- a = first term d = common difference r = common ratio

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