Question 39

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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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