Try this:

A1: AAS
B1: =SUMPRODUCT((LEFT(A4:A2002,LEN(A1))=A1)*(B4:B2002 0)*(D4:D2002<1))

Does that help?
***********
Regards,
Ron

XL2002, WinXP-Pro


"Scire" wrote:

Need to count the number of time that first 3 characters in col a appear,
based on col b 0 and col c<1.
The following formula is not working, the formula is not finding AAS:
=SUMPRODUCT($A$4:$A$2002="aas*",$B$4:$B$20020,$D$ 4:$D$2002<1)

Data:
A B C D
AASR241 1 1 1
AASR340 1 1 0
AASR444 1 1 0
CAP1201 1 1 0

the results should be 2.

Thanks in advance.