Addition or Subtraction of Sum

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)

(Expanding)

Notice that the total members between two sums are the same

Example

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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. http://people.revoledu.com/kardi/tutorial/BasicMath/Sum/