On 7/17/2019 9:46 AM, TIMOTHY wrote:
Thank you Alan & Rover

I have searched on google and found out the formula

=sumproduct(--(Range1,criteria1),--(Range2,criteria2),Range3,Range4)

=sumproduct(num(Range1,criteria1),num(Range2,crite ria2),Range3,Range4)

I don't know who started this idiom of a double-negation operator
instead...but it's a least confusing to read if nothing else and seems less
efficient besides.

The double negative refs only negative values in the specified ranges. In other
uses it forces a negative value.

--
Garry

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