[35 points] sing four step development method, design, write, compile, and run a C++ program to calculate th sum of the even integers (say from 1 to 50 or from 25 to 100). Here is the formula for calculating su RAMMING PROBLEM 1: sum for an arithmetic progression series: sum 2a(n -1)d OA n is the number of integers to be added, a is the first number in the series, d is the difference between each number. Make sure that the division by 2 in the formula is implemented properly in your program