Question 18

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Jambmaths question: 

The nth term of the sequence $\tfrac{3}{2},3,7,16,35,74,-,-,-$ is

Option A: 

$tfrac{3}{2}$

Option B: 

$3\cdot {{2}^{n-2}}$

Option C: 

$5\cdot {{2}^{n-2}}-\tfrac{n+1}{2}$

Option D: 

$5\cdot {{2}^{n-2}}-n$

Jamb Maths Solution: 

The best method and that would save time is to work from the options provided by substituting n = 1, 2, 3. By so doing you will discover that Option D is the correct option

Answer: Option D

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