If the sum of an arithmetic sequence is Sn=3n2S_n = 3n^2Sn=3n2, find the nthn^{th}nth term ana_nan.
an=6n−3a_n = 6n - 3an=6n−3
an=3n−3a_n = 3n - 3an=3n−3
an=6n+3a_n = 6n + 3an=6n+3
an=3n+3a_n = 3n + 3an=3n+3