# Sum of Arithmetic Sequence

"Programming is not a zero-sum game..." // John Carmack

A sequence with same common difference is known as

**arithmetic sequence**. The first term of sequence is**a**and common difference is**d**. The series looks like**a, a + d, a + 2d, a + 3d, . . .**How many terms to go is**n.**Arithmetic sum formula is shown below - this is all domain knowledge required for this exercise.

$\sum_{k=0}^{n-1}(a+kd)=\frac{n}{2}(2a+(n-1)d)$

**Write a CC for finding the sum of n-terms of an arithmetic sequence**requiring these three parameters

**a,**

**d,**

**n**mentioned above from user input, let those be integers. Your task is to write it using

`range`

function to sum these parameters, but in addition write a verification code using math functions according to given formula.Last modified 2yr ago