Equalities : Summations
In the answer given by an OTA to a previous question I had asked, there are three steps I do not understand.
Step 1
Why is it that
Step 2
Why do we have
Step 3
Finally, why is the previous line equal to
I would be very grateful if you could explain these three steps to me.
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Step 1
Why is it that
Step 2
Why do we have
Step 3
Finally, why is the previous line equal to
I try to give ...
Solution Summary
Some equalities are clarified. The solution is detailed and well presented.
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