Sequences and series
- 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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