If `a_n=3n+4` is the nth term of an AP then find the first four terms

if nth term of an AP is 3n+2 then find the sum n terms.

The nth term of a sequence is a_(n)=2n+3 . Find its first four terms.

The nth term of a sequence is a_(n)=2n+3 . Find its first four terms.

If the sum of the first n terms of an A.P. is 4n-n^(2) what is the first term? What is the sum of the first two terms? What is the second term? Find the 3rd, 10th, and the nth terms.

If the nth term of an A.P. is 4n-1 , find the 30th term and the sum of first 30 terms.

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

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

T_n=4n-10 is the nth term of a sequence. Find whether it is an A.P. or not. If it is an A.P. Find it's first term and C.D.

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