I have the following formula:

=AVERAGE('[#1 Turb-Jun09.xls]7'!$E$164,'[#1 Turb-Jun09.xls]7'!$D$164,'[#1
Turb-Jun09.xls]7'!$C$164)

It references a monthly workbook (#1 Turb-Jun09.xls) with a sheet for every
day in the same workbook. In this case, I am averaging three cells on the
sheet labeled 7. The data points and cells are identical (although not in
value) in every sheet. All I wish to do is copy this formula to replace the
three 7's with an 8, then 9, then 10 and so on without manually doing that.

I have tried filling out 7 of them to see if autocomplete could recognize
the pattern when they are highlighted, but it doesn't.

Thank you for your help.