Find the sum of `n` terms of an A.P. whose kth terms is `5k+1.`

Find the sum to n terms of the A.P., whose kth term is 5k+1.

Find the sum of 'n' terms of an A.P. whose nth term is 2n+1.

Find the sum of n terms of an A.P. whose nth term is (2n+1).

find the sum of n terms of an AP whose rth term is ( 5r+1)

Find the sum to n terms of the A.P.whose k^(th) term is 5k+1

(i) If the sum of a certain number of terms of the A.P. 25,22,19,………………….. is 116, find the last term. (ii) Find the sum of 32 terms of an A.P. whose third terms is 1 and the 6th term is -11.

Find the sum of n terms of an A.P.whose nth terms is given by a_(n)=5-6n

Find the sum of first n terms of an AP whose nth term is (5n-1). Hence,find the sum of first 20 terms.

Find the sum of first 25 terms of an A.P. whose 4th term is 13 and 22nd term is 67.

Find the sum to n terms of an A.P.whose nth terms is t_(n)=5+6n,n in N