I'm trying to SUM a range (AA5:AA350). However, the numbers have bee
generated via a VLOOKUP, and hence I've got a few N/A's dotted around
Seems that Excel doesn't like this - and returns an N/A result.
I suspect there's some means of doing the SUM with an added ISNA o
ISERROR, however I haven't been able to sort out the correct formula
Can anyone help?