I am using MS Vista and Excel 2007. My question is how do I sum even columns
in a spreadsheet? My spreadsheet is set up in the following manner:

11/7/08 11/14/08 11/24/08
Col A1 Col B1 Col C1 Col D1 Col E1 Col F1 Col
G1...etc
Sold to 20 $20.00 10 $10.00 5 $5.00

In column B1, D1 and F1 I have a number and in column C1, E1 and G1 I have
an associated cost. The spreadsheet can require expansion to the right to
column EZ. My question is how do I sum Column B1, D1...EZ1 in a
predetermined cell (FA1)? I cannont use the sum function as it has a limit
on the number of individually selected cells that can be summed. Is there a
way to tell it to sum starting at B1 every other cell to the right stopping
at EZ1?

Thanks in advance for your help.