Sequences and series

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Arithmetic sequences
Arithmetic series
Geometric sequences
Geometric series
Sum to infinity
Sigma notation
Recurrence relations
Modellign with series

Sequences and series

Use the formula: 1/2 n [2a+(n-1)d]

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An arithmetic series has the first term -3 and common difference d.
The sum of the first 20 terms of the series is 320.
Find the value of d.

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