Question

Assertion (A): In an AP, Sn = n² + n then a20 = 40 Reason (R): In an AP d = an – an-1

Assertion: If the sum of the first n terms of an AP is Sn = 3n² − 4n, then its nth term is an = 6n − 7. Reason: The nth term of an AP whose sum to first n terms is Sn, is given by an = Sn – Sn – 1.

If the sum of the first n terms of an AP is 4n – n², what is the 10th term and the nth term?

In an AP, if Sₙ = n (4n + 1), find the AP.