Remove duplicates and count on one column based on values from another column

Question

Column A Column B
A    PASS
A    PASS
B    PASS
C    PASS
D    PASS
E   
F    PASS
E    PASS

I want a formula that will return the following count: Filter by Column B for PASS. Count all elements in column A after removing duplicates. I am a novice at Excel formulae. Any help is appreciated.

Answer 1

Try this formula

=SUM(IF(FREQUENCY(IF(B2:B100="Pass",IF(A2:A100<>"",MATCH(A2:A100,A2:A100,0))),ROW(A2:A100)-ROW(A2)+1),1))

confirmed with CTRL+SHIFT+ENTER

....shorter version, but possibly less efficient, for Excel 2007 or later versions

=SUMPRODUCT(((B2:B100="Pass")*(A2:A100<>""))/COUNTIFS(B2:B100,B2:B100&"",A2:A100,A2:A100&""))

assumes data in rows 2 to 100 (blanks allowed), adjust as required