Excel/Sum of rows

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Question
Dear Bob Umlas,

I want to calculate the sum of each subsequent 2 rows. What formula can I use?
For ex:
 Year   Sex  Pop size
A1  2001   M    100
A2  2001   F    110
A3  2002   M    120
A4  2002   F    125

Then I want automatically calculate population of both sexes in each year. I calculated sum (A1:A2) and want to automatically calculate sum (A3:A4)etc.
Thank you for your help in advance.

Answer
Assuming the "100" in your figure is in cell C2:
if you have =SUM(C2:C3) in cell D3, for example, select D2:D3 (D2 being blank), click on the fill handle at the bottom of D3, and fill down as far as you need. You'll see the formula you want in D3, D5, D7, ...
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Bob Umlas

Expertise

I`m a Microsoft Excel MVP (Most Valuable Professional) and have been since the inception of the program in 1995. I can answer every kind of Excel question except: API, Importing/exporting to other programs (powerpoint, word,...) Also check out my in-person training link at http://www.thumbtack.com/ny/new-york/excel-training/

Experience

Worked with MS Excel since version 0.99 (on the Mac!). Was contributing editor to Excellence Magazine, having written >300 articles. John Walkenbach said of me "I finally met someone who knows as much about Excel as I do."

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Excellence, The Expert, Microsoft

Education/Credentials
BA in math, Hofstra University, 1965

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MVP
Led sessions for the Convergence 2004-2006 seminar on Excel tips & tricks

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