Yes, I meant the latter:
1 to 6, 7 to 12, 13 to 18, etc.
I thought that perhaps there is a formula using bin of 6, but what you
suggested works very well.
Many thanks, Joanna
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.