What is Arithmetic Sequence?

An arithmetic sequence is a sequence of numbers, where the difference between one term and the next is a constant. For example, 1, 4, 7, 10, 13, 16, 19, 22, 25, … is an arithmetic sequence with common difference equal to 3. It is also termed arithmetic progression and is commonly represented as:

a, a + d, a + 2d, a + 3d, a + 4d, ………. ,a + (n – 1) d

Where, 

a = first term

d = common difference between the terms

n = number of terms