Summing Groups of Every N Values in a Row


Cells in the range B2:M2 contain numerical values, and the row above contains matching serial numbers.
We want to subdivide the values into batches of three and calculate the sum of each batch.
Solution 1:

Use the SUM and INDEX functions as shown in the following formula:

Solution 2:

Use the SUM and OFFSET functions as shown in the following formula:


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