This works on your sample data where there are no duplicates in column A and
the values in column B are either 1 or 0:

=SUMIF(A$2:A$7,C2,B$2:B$7)

If your sample data is "make believe" then try this generic formula:

=--(SUMPRODUCT(--(A$2:A$7=C2),--(B$2:B$7=1))0)

--
Biff
Microsoft Excel MVP


"Langway" wrote in message
...
Ok, I think I have a tricky one.

A B C
101 1 100
102 0 101
104 0 102
105 1 103
109 1 104
110 0 105

I'm trying to put a formula in column D that will tell me...
If C2 is found anywhere in Column A AND on the same the same row in column
B
there is a 1, then 1, if not 0.

Thanks in advance for your help!!!