Arithmetic

An **arithmetic sequence** is a** **sequence that adds a constant from one term to the next. The common value added or subtracted between two successive terms of an arithmetic sequence is called the **common difference**, *d*.

An example of an arithmetic sequence is 4, 7, 10, 13, 16 … and the common difference of this sequence is 3. To change one term to the next in the sequence, add three.

In general, the terms of a sequence are written as: *a _{1}, a_{2}, a_{3}, a_{4} ...a_{n}*where