Neither of these formulae should work as you're using a semi-colon (;) as your function argument separator rather than a comma (,)
But index numbering of sheets isn't relevant to the calculation at all.... if it needs to retrieve data from a sheet it is always referenced by sheet name/title
But index numbering of sheets isn't relevant to the calculation at all.... if it needs to retrieve data from a sheet it is always referenced by sheet name/title