Jambmaths question:
The nth term of the sequence 3, 9, 27, 81 …… is
Option A:
$3\times {{3}^{n-2}}$
Option B:
$3\times {{3}^{n-1}}$
Option C:
$3\times {{3}^{n-2}}$
Option D:
$3\times {{3}^{n-1}}$
Jamb Maths Solution:
$\begin{align} & {{T}_{1}}=3=3\times {{3}^{1-1}} \\ & {{T}_{2}}={{3}^{2}}=3\times {{3}^{2-1}} \\ & {{T}_{3}}={{3}^{3}}=3\times {{3}^{3-1}} \\ & {{T}_{n}}=3\times {{3}^{n-1}} \\\end{align}$
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