The sum of an arithmetic progression

Writing functions:

arphsum(a, b, c)

Where

a - the first member of progression, b - latest member progression, c - membership progression

A mathematical function that performs the operation of finding the sum of an arithmetic progression is an important tool in the field of mathematics and programming. This function allows you to find the sum of a given number of elements of the progression, taking into account the initial value, the step of the progression and the number of elements in it.

Thus, the "arphsum" function allows us to easily and efficiently find the sum of an arithmetic progression, which makes it very useful in various tasks related to mathematics and programming.