SOLUTION:

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Question 296839:
Found 2 solutions by richwmiller, jrfrun:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
no similar problems.

Answer by jrfrun(3) About Me  (Show Source):
You can put this solution on YOUR website!
The sum of the first 400 even numbers = 2*(sum of the first 200 numbers)
ie 2+4+6+ ....+ 400 = 2(1+2+3+4+...+200) = 2*200*201/2=200*201=40200