try
=sumproduct((s1!a2:a22=a2)*(s1!b2:b22=b2)*s1!c2:c2 2)

--
Don Guillett
Microsoft MVP Excel
SalesAid Software

"Norm" wrote in message
...
I'm not sure I am explaining this right
I want the data from C21 on sheet 1 in a cell on sheet 2 if the A & B
column
data matches
SHEET 1 row 21
A B C D E
4/21/2010 34287 74 3 4

SHEET 2 row 20
A B C D E
4/21/2010 34287 74