Excel: count unique for each


excel 2010 I need to count the unique ProjectName (column B) for each ProjectID (column A) and enter it in column C i.e. MD has 1 unique name, BW has 2 unique names... .........A...........B..........C 1......MD.......McDan.....1 2......MD.......McDan.....1 3......BW.......Bill..........2 4......AF........Alf...........1 5......BW.......Billie........2


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