A sequence is a set of numbers arranged one after another.
a1, a2, a3 ,..., an
3, 6, 9,..., 3n
The numbers a1, a2 , a3 , ..., 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 an.
Calculation of a Sequence
By the Nth Term
an is a criterion that allows us to calculate any term of the sequence.