Question:
i want to know that in ur video of sequences and series part 18 in sum of n terms of special series why u did (k 1)^4 - k^4
Answer:
We have to find the sum of the series
13 + 23 + 33 +..............n3
Since this series is neither in AP nor in GP,
So, we convert this series in such a way that it becomes either in AP or in GP
So, for converting this series into AP or GP, we have applied the formula (K + 1)4 - K4
Rest of things are well explained in the video.
Hope you got the point.
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