The formula first creates a number series till n-values and that is feed to small to get the n-smallest values, Then the values are summed by SUMPRODUCT function.
How to vlookup multiple values for a given criteria
How to retrieve multiple values for a given criteria by Vlookup concept
Category: Math and trigonometry
Returns the sum of the products of corresponding array components
SUMPRODUCT(array1, [array2], [array3], ...)
Returns the k-th smallest value in a data set
Category: Lookup and reference
Returns the row number of a reference
Returns a reference indicated by a text value
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