Given a range in column (e.g. containing 1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4) is there a way to use conditional formatting to alternate colors for the differenet groups of values (that is: 1s in red, 2s in black, 3s in red, etc.)?
OK. I'm not sure how to do that with standard CF.
You could use it to apply a colour based on whether the value in the current cell is the same as the one in the previous cell, but that's not quite what you're after.
It would give you something like this