Use a different function ... SumProduct().

=SumProduct((A1:A100=criteria1)*(B1:B100=criteria2 )*C1:C100)
--
HTH,

RD
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Please keep all correspondence within the Group, so all may benefit!
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"AHANG JJJ" <AHANG wrote in message
...
What is the syntax for sumif function with two criteria range and two
criteria?