Arithmetic Sequence Definition
definition: an = a1 + f × (n-1)
example: 1, 3, 5, 7, 9 11, 13, ...
Arithmetic progression is a sequence of numbers in which each differs from the preceding one by a constant quantity (e.g. 1, 2, 3, 4, etc.; 9, 7, 5, 3, etc.).
This constant difference is called common difference.each member of progression can be expressed as
Sum of the n members of arithmeic progression can be expressed as