For more details on SUMPRODUCT
Bob Phillips
http://www.xldynamic.com/source/xld.SUMPRODUCT.html
J.E McGimpsey
http://mcgimpsey.com/excel/formulae/doubleneg.ht

BTW: why the unnecessary + after the = in your formula?

best wishes
--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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"DogEatDog World" <DogEatDog wrote in
message ...
I got one excel book and I was very intriegued by use of sumprod function
=+SUMPRODUCT(--($C$8:$C$109="A");--(D$8:D$1090))
Now I need to use it so I would like to know what does it do(in general)
In example above it finds in range $C$8:$C$109 cells that have "A" gives
them value 1 and multiplies with corresponding cell in range D$8:D$1090
which it also gives value 1. Is it possible that all that is done with
just a
-. When I click at the formula it doesn't show explanation for that only
for
sumprod