Using SUMPRODUCT FUNCTION Using  double unary minus (–)  n SUMPRODUCT Function -> A significant use   ————————————————————————————————————————————————————   Excel SUMPRODUCT Function:   The SUMPRODUCT function multiplies corresponding items of two or more arrays and then sums up these products.   Syntax: SUMPRODUCT(array1, array2, … array255)   1. array1, array2, … array255 are arrays whose...