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 Past Tip of the Day Jenny asks "Is there a quick way of adding every other cell ?, I have a column of about 250 cells, and I have to select them manually using Ctrl. Can you help ?"Jenny, this is a matter of using a little math to remember how to determine if a number is even or is odd, and then translate that into the formula.The formula=MOD(A1,2)would return 0 if the number is even and 1 if odd. If we use instead of A1, the ROW() function, we can know if a particular row is even or odd. Now, suppose you're trying to calculate this formula=A1+A3+A5+A7+A9 ... etc.or this one=SUM(A1,A3,A5,A7...)=SUM((MOD(ROW(A1:A250)-ROW(A1),2)=0)*(A1:A250))Remember, this is a CSE Formula, to enter it you must press at the same time Control Shift Enter, instead of just Enter as regular formulas.You can also use this non-array formula=SUMPRODUCT((MOD(ROW(A1:A250)-ROW(A1),2)=0)*(A1:A250)) By Juan Pablo Gonzalez on 24-Jan-2002 MrExcel.com Consulting can be hired to implement this concept, or many other cool applications, with your data. MrExcel.com provides examples of Visual Basic procedures for illustration only, without warranty either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose. The Visual Basic procedures on this web site are provided "as is" and we do not guarantee that they can be used in all situations.

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