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Adding Every Other Cell in a Column

January 24, 2002 - by Juan Pablo Gonzalez

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:


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:


Following formula will do the trick:


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