the answer in the form of cell number and column number of unique number is correct. No problem. But the answer of the number used twice in the sheet is wrong. in above sheet 320 number is written two times and it is mandatory. So answer of first 320 number should be cell number 16 and column number should be 12. and answer of second 320 number should be cell number 28 and column number should be 13. But after using the formula the answer of 320 number displayed is cell number 42 and column number 25, which is wrong.