Question: Prove formula (e) of Theorem 3 using a method similar to that of Example 5, Solution 1 [start with (1 + i) 4 i
Prove formula (e) of Theorem 3 using a method similar to that of Example 5, Solution 1 [start with (1 + i)4 – i4].
Data from Formula e of theorem 3

Data from Example 5, Solution 1
![sum): Let S be the desired sum. We start with the telescoping sum (or collapsing 71 [(1 + i)1] = (2 1) + (3](https://dsd5zvtm8ll6.cloudfront.net/images/question_images/1699/3/4/3/4346549ec4a1bf541699343433623.jpg)
(e) ;3 i=1 n(n + 1) 2
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