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.
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.
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