1----Serial No.
2----123
3----123
4----124
5----125
6----123
7----125
8----128
9----125
In this case cell no. 6 and 9 should be highlighted.
1----Serial No.
2----123
3----123
4----124
5----125
6----123
7----125
8----128
9----125
In this case cell no. 6 and 9 should be highlighted.
assuming your data is in column A, select from row 2 downwards and apply conditional formatting using the formula
=countif($A$1:$A1,A2)>=2
If, for example, your data is in column A and starts in cell 1, you can add the following formula to cell B3
and fill down :
=AND(A3=A2, A2=A1)
Then, Autofilter on column B for cells with value TRUE
, and highlight the corresponding cells in column A.