## Arithmetic Series

The difference between a sequence and a series is that, for a series, the terms of the sequence are being added:

$5, 8, 11, 14, 17, ...$ – Sequence
$5 + 8 + 11 + 14 + 17 + ...$ – Series

An arithmetic series is a series whereby the terms of the series increase by the same amount each time – this amount is known as the common difference and is often denoted $d$. In the series above $d=3$.