Or is this what you're looking for...

=IF(ISNUMBER(A1)*ISNUMBER(B1),IF((LOOKUP(2,1/A1:A10,A1:A10))*(INDEX(B:B,LOOKUP(2,1/A1:A10,ROW(A1:A10)))=""),LOOKUP(9.99999999999999E+ 307,C:C),0),"")

or, maybe this one...

=IF(ISNUMBER(A1)*ISNUMBER(B1),IF((LOOKUP(2,1/A1:A10,A1:A10))*(INDEX(B:B,LOOKUP(2,1/A1:A10,ROW(A1:A10)))=""),INDEX(C:C,LOOKUP(2,1/A1:A10,ROW(A1:A10))),0),"")


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Domenic
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