If sum of $n$ terms of a sequence is given by $S_{n} = 3n^{2} - 5n + 7$ and $t_{r}$ represents its $r^{th}$ term, then
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If sum of $n$ terms of a sequence is given by $S_{n} = 3n^{2} - 5n + 7$ and $t_{r}$ represents its $r^{th}$ term, then