Where is the Longest String
Solution 1:
Because it's Gary's Student:
=ADDRESS(MIN(IF(LEN($C$4:$G$11)=MAX(LEN($C$4:$G$11)),ROW($C$4:$G$11))),MIN(IF(LEN($C$4:$G$11)=MAX(LEN($C$4:$G$11)),COLUMN($C$4:$G$11))),4)
It is an array formula so Ctrl-Shift-Enter.