I am taking a data structures course, and could use a little help with the concept of searching efficiency. So far, we have studied how having an indexed array can be used when searching a file, but one of the questions is confusing me. It asks:

Compare the efficiency of searching an ordered sequential table of size b and searching an un-ordered table of the same size for the key key:

- If no record with 'key key' is present

I have not been able to get in contact with the instructor, but im guessing 'key key' is not a typo. Can someone help clarify what this is asking? I would guess that its saying if we have 2 tables, one ordered, and one unordered, is the searching efficiency effected by having a 'key key'. I'm just a little confused, any help would be greatly appreciated.