If the 2 nd , the 31 st and the n th term of an Arithmetic progression are respectively 7\frac{3}{4} , \frac{1}{2} and -6\frac{1}{2} then the sum of the first n terms of this progression is

AP Police Constable Mains 17 Mar 2019 Solved Paper

Question : 71 of 200

Marks: +1, -0

If the 2^nd, the 31^st and the n^th term of an Arithmetic progression are respectively 7

\;{3}/{4}

\;{1}/{2}

and -6

\;{1}/{2}

then the sum of the first n terms of this progression is

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