### Sequences And Series

A sequence (or progression) is a set of terms which are written in a definite order, obeying a certain rules.

Eg: 1, 3, 5, 7, …

A series is the sum of the terms of a sequence.

Eg: 1 + 3 + 5 + 7 + …

**Example 1**

Write down the next three terms in each of the following sequences.

(a) 14, 11, 8, 5, …

(b) 1, 2, 4, 8, …

(c) 1, 3, 7, 15, …