[" 17.The sum of first "n" terms of a series is "n^(2)+an+b" .Show that "],[b=0" and the series is in A.P."]

The sum of first n terms of a series is an^(2) + bn + c . Show that c = 0 and the series is in A.P.

The sum of first n terms of a certain series is given as 2n^(2)-3n . Show that the series is an A.P.

If the sum of the first n terms of the series

The sum of n terms of a series is (2n^(2)+n) .Show that it is an A.P. .

If the sum of first n terms of a series is 2n^(2) + 3n , find the series.

The sum of first n terms of a certain series is given as 3n^(2)-2n . Show that the series is an arithmetic series.

The sum of n terms of a series is (3n^(2)+2n) . Prove that it is an A.P.

The sum of fIrst n terms of an A.P series is 26n-2n^2 . Find the fifth term.

The sum of p terms of a series is 3p^(2) + 5p . Prove that the terms of the series form an A.P.