Question
If $S_{n}=\frac{1}{54}\left[3^{n}-1\right]$, find $T_{n+1}$ and hence Write the $G.P.$
✓
Answer
$\overline{T_{n+1}}={ }_{27}^{1} \cdot 3^{n} ;=3^{n-3} ;{ }_{9}^{1},{ }_{3}^{1}, 1, \ldots \ldots$
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