Find the sum of the first 25 terms of an A.P. whose `n t h` term is given by `a_n=2-3n` .

Find the sum of the first 25 terms of an A.P. whose nth term is given by a_(n)=7-3n

Find the sum of first n term of the A.P., whose nth term is given by (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 A.P. whose nth term is (2n+1).

Find the sum of first 24 terms of the list of numbers whose nth term is given by a_(n)=3+2n

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

If the sum of first 24 terms of a sequence whose n^(th) term is given by t_(n) = 3+(2n)/3 is k , then what is the value of k ?

Write the n t h term of an A.P. the sum of whose n terms is S_n .