DEFINITION: A sequence is a set of numbers written in a special and well defined order.
Ex a) 2,4,6,8,10, … b) 3,5,7,9,11, … c) 1,3,6,10,15, … d)2,3,5,7,11,13, …
The dots at the end of the numbers show that the sequence can be continued as far as possible. From the examples above we can say that
a) is a set of even numbers, b) is a set of odd numbers, c) is a set of triangular numbers, d) is the set of prime numbers
Each member of a sequence is called a term. For example, 4 is the second term of the set of even numbers. The order of the sequence is called rule of the sequence.
