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CAN U ALL HELP ME TO SOLVE THIS QUESTION?
I don't know how to start...
The sum of the first 2n terms of a series P is 20n-4n^{2}. Find in terms of n, the sum of the first n terms of this series. Show that the series is an arithmetic series.
I don't know how to start...
The sum of the first 2n terms of a series P is 20n-4n^{2}. Find in terms of n, the sum of the first n terms of this series. Show that the series is an arithmetic series.