I have multiple rows of data where I want to add the first three entries in
each row and compare the total to the last three entries in the row. However
some of the rows have blank fields so some rows will have differently spaced
first and last three entries. If there are less than six entries then the row
is invalid

Here is an example

A B C D E F G H I J K
1 5 6 8 4 2 5 7 8 3 1 2 1st 3 = 19,
last 3 = 6
2 - 3 4 2 - 4 4 - 8 9 3 1st 3 = 9,
last 3 = 20
3 4 - - 8 7 - 5 6 - 2 - 1st 3= 19,
last 3 = 13
4 - 1 2 4 - - - 7 2 - - invalid

So I need a couple of fomulas that add the frist three and last three of any
list of data


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Rich