SUMPRODUCT(...)
How to sum given an array of values.
Used Functions
Category: Math and trigonometry
Returns the sum of the products of corresponding array components
Syntax
SUMPRODUCT(array1, [array2], [array3], ...)
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SUMPRODUCT formula at Microsoft help
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The formula starts by looking for multiple criteria one by one and then the resulting arrays are multiplied with each other. The final sum is done by using SUMPRODUCT().