Reference every nth cell from a different worksheet

Question

Ive been looking around for a while now, and Ive found what is working solutions for others, but I cant get any of them work despite trying for an hour now.

I have a document with 2 worksheets. 'Plan' and 'Install' What I want to do is copy every 3rd cell from o9 (09,o12,o15,o18 etc) in 'Plan' to a single row fo cells in 'Install'

What Ive read that I should do is this: =INDEX('Plan'!$O$9:$O$21,(ROWS($1:1)-1)*3+1) And then copy it in all the rows downwards.

But it gives me an error at "$O$21," - Can anyone help?

Thanks in advance.

Answer 1

The reason I had such troubles, was because of the language things as Jeeped mentioned. Because I have a Danish installation, I had to write certain parts of the formula in Danish. Silly it cannot understand English if you ask me, but oh well. The answer was as follows:

=INDEKS('Cable Plan'!O:O;(RÆKKE(1:1)-1)*3+9)

After that you can mark the cell and drag it down as far as needed.