Whats the sum of all even numbers between 2 and 1000

His allows you to set up a summation of the form:

Summation from i = 1 to 500 of i.

The general solution to the summation of i from 1 to n is n(n+1)/2. In this case, n = 500.

500(501)/2 = 125250

Recall that you divided the sum by 2 to simplify its computation. Now multiply your result by 2 for your final

125250 * 2 = 250500

Answer is: 250500

x=0y=0
while(x<=1000):    y += x    x += 2
print(y)