If SnS_nSn is the sum of nnn terms of an AP, and Sn=kn2S_n = kn^2Sn=kn2, what is the ratio anSn\frac{a_n}{S_n}Snan?
2n\frac{2}{n}n2
1n\frac{1}{n}n1
2n−1n2\frac{2n-1}{n^2}n22n−1
111