What is the next number in the series 2, 1, \( \frac{1}{2} \), \( \frac{1}{4} \)...

Assessment: JAMB UTME - Mathematics - 2017 Subject: General Mathematics

Question 1 Report

What is the next number in the series 2, 1, \( \frac{1}{2} \), \( \frac{1}{4} \)...

Answer Details
2, 1,  1 2 ,  1 4 .....
There are 4 terms in the series
Therefore the next number will be the 5th term
Tn = ar n − 1  (formular for geometric series)
a = first term = 2
r = common rate =  next term previous term  =  1 2
n = number of terms
T5 = 5th term = ?
T5 = ar 5 − 1
= ar 4
= 2 × (ar n − 1 )4
= 2 ×  1 16
= 

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