waecmaths question:
Find the nth tem of the sequence 5, 10 , 20, 40, 80,…
Option A:
$5\times {{2}^{n+1}}$
Option B:
$2\times {{5}^{n-1}}$
Option C:
$5\times {{2}^{n-1}}$
Option D:
$5\times {{5}^{n-1}}$
waecmaths solution:
$\begin{align} & {{T}_{1}}=5\times {{2}^{0}} \\ & {{T}_{2}}=5\times {{2}^{1}} \\ & {{T}_{3}}=5\times {{2}^{2}} \\ & {{T}_{4}}=5\times {{2}^{3}} \\ & {{T}_{n}}=5\times {{2}^{n-1}} \\\end{align}$
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