By Kardi Teknomo, PhD .

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Can I expand or regroup the sum?

Yes, you can expand or regroup two sums as long as the numbers of elements are the same. Here are the formulas

regrouping sum (Regrouping)

expanding sum (Expanding)

Notice that the total members between two sums are the same


example sum regrouping

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See Also: Kardi Teknomo's Tutorial

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This tutorial is copyrighted .

Preferable reference for this tutorial is

Teknomo, Kardi (2015) Summation Tutorial.