A sequence is a set of numbers arranged one after another.

**a _{1}, a_{2}, a_{3} ,..., a_{n}**

3, 6, 9,..., 3n

The numbers **a _{1}, a_{2} , a_{3} , ...,** are called terms or elements of the sequence.

The subscript is the set of positive integers 1, 2, 3, ... The subscript indicates the place that a term occupies in the sequence.

The nth term is denoted by **a _{n}**.

### Calculation of a Sequence

## By the Nth Term

**a _{n }**is a criterion that allows us to calculate any term of the sequence.

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