In mathematics, An arithmetic progression is a sequence of numbers such that the difference of any two successive numbers of the sequence is a constant.

Arithmetic Progression = a_{1} + (n-1)* d

where:

a_{1} -> the first term in the series,

n -> last term in the series

d -> Common difference.

The nth term: a_{n} = a_{m} + (n-m)d

For instance, the first term a_{1} = 1, n = 3, common difference d = 2, Then the sequence is 1, 3, 5.

The 3th term is 5, Sum of first 3 terms is 9.

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