If the nth term of a AP is given by `a_n=5n-3` , then the sum of first 10 terms is

If the nth term of an A.P. is t_(n) =3 -5n , then the sum of the first n terms is ………

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

The nth term of an AP. Is (3+n)/(4) , then the sum of first 105 terms is

In the A.P. nth term of an A.P. is given by (-4n + 15). Find the sum of first 20 terms of A.P.

The nth term of an A.P. is 7n-5, find the sum of first 20 terms of the series.

If the sum of the first n terms of an AP is given by S_n=3n^2-n then find its nth terms, first term and common difference

If S_n the sum of first n terms of an AP is given by 2n^2+n , then find its nth term.

If the nth term a_n\ of a sequence is given by a_n=n^2-n+1 write down its first five terms.