# Series and Sequence

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- Created by: Sarah Walber
- Created on: 03-03-13 14:48

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- Sequences and Series
- Arithmetic Sequence
- Progression
- Formula to find a term: Un = a+(n-1) d
- It is a sequence that changes by a constant amount
- a = first term, d = common difference

- Series
- Formula for the sum: Sn = n/2(2a+(n-1)d)
- Formula for the last term: n/2(a+l)
- a = first term, d = common differnece

- Progression
- Geometric Sequence
- Series
- Formula for the sum: Sn=a((r^n -1)/(r-1))
- Sum to infinity: S?=a/1-r
- a= first term, r = common ratio

- Progression
- Formula to find a term: Un=ar^n-1
- a = first term, r = common ratio

- Series

- Arithmetic Sequence
- Progression
- Formula to find a term: Un = a+(n-1) d
- It is a sequence that changes by a constant amount
- a = first term, d = common difference

- Progression
- Formula to find a term: Un=ar^n-1
- a = first term, r = common ratio

- Formula for the sum: Sn=a((r^n -1)/(r-1))

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