100 100 100. As you can see it will add up to 100 each time you do this. Seeing as we are only adding up the odd numbers.

SUM OF EVEN NUMBERS: Formula: How to Find N = (First Even + Last - 1. Example: . 100. N = (2+ 100)/2 - 1 = 50. Here is a more generic way to think about this that lets you calculate any equally spaced series of numbers:. Beat The GMAT on Facebook. Rethinking Arithmetic: A Visual Guide. Check out our free B-School Guides to learn how you compare with other applicants. Lookup most frequent item [Homework].