The nth term of an AP is given by (-4n+15). Find the sum of first 20 terms of this AP

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(4 n + 1)

15

(\frac{5 n^{2}}{2} + \frac{3 n}{2})

(\frac{3 n^{2}}{2} + \frac{5 n}{2})

The $n^{t h}$ terms of an A.P. is given by $(- 4 n + 15)$ . Find the sum of first $20$ terms of this A.P.

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Find the sum of first 25 terms of an AP whose nth term is 1-4n.

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