Double negation coerces Boolean FALSE/TRUE to 0/1

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

--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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"bob" wrote in message
...
this seems to work...thank you very much. can you please tell me the
function
of the two dashes (--). thanks.

"T. Valko" wrote:

Try this:

=SUMPRODUCT(--(Chart1!$B$2:$B$7500=$C2),--(Chart1!$C$2:$C$7500=$A2),--((Chart1!$L$2:$L$7500=$B2)+(Chart1!$N$2:$N$7500=$B 2)0),Chart1!$AV$2:$AV$7500)


--
Biff
Microsoft Excel MVP


"bob" wrote in message
...
I am seeking a formula for the following:

On the current worksheet, if $B2 = Chart1!$L$2:$L$7500 OR
Chart1!$N$2:$N$7500
AND
If $A2 = Chart1!$C$2:$C$7500
AND
If $C2 = Chart1!$B$2:$B$7500
then I want to add all corresponding numbers in Chart1!$AV$2:$AV$7500.

thanks in advance,
Bob