Returns the sum of the products of corresponding array elements.
SUMPRODUCT(array1; array2; ... array30)
array1 to array30 are up to 30 arrays or ranges of the same size whose corresponding elements are to be multiplied.
SUMPRODUCT returns for the i elements in the arrays.
You can use SUMPRODUCT to calculate the scalar product of two vectors.
SUMPRODUCT evaluates each parameter array1 to array30 as an array formula but does not need to be entered as an array formula. In other words it can be entered with the Enter key, rather than Cntrl-Shift-Enter. See the example below.