Sum Every Nth column Starting From Column 1

There are instructions at the top of the page explaining how to attach your sample workbook (yellow banner: HOW TO ATTACH YOUR SAMPLE WORKBOOK). Screenshots are of little practical use as we cannot manipulate them.

A good sample workbook has just 10-20 rows of representative data that has been desensitised. The sample layout accurately matches that of your real data. It also has expected results mocked up, worked examples where required, relevant cells highlighted and a few explanatory notes.

You could give this a try:

=SUM(FILTER(Table1,ISODD(COLUMN(Table1))))

Or this:

=SUM(FILTER(Table1,MOD(COLUMN(Table1),2)=1))

I discovered the solution myself, SEQENCE required a start position because it defaults to 1. The starting position should be set to 0 as per the formula below.

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This is shorter:

=SUM(FILTER(Table1,MOD(COLUMN(Table1),2)=1))

Glad to have helped.

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Thanks for the rep.

Please update your forum profile to the version of Excel that you are using, as Pete mentioned.