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JAMB Mathematics 2017 Paper
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© africaexams.com
Question : 2
Total: 44
What is the next number in the series 2, 1,
1
2
,
1
4
...
1
3
2
8
3
7
1
8
Validate
Solution:
2, 1,
1
2
,
1
4
.....
There are 4 terms in the series
Therefore the next number will be the 5th term
T
n
= ar
n
−
1
(formular for geometric series)
a = first term = 2
r = common rate =
next term
previous term
=
1
2
n = number of terms
T
5
= 5th term = ?
T
5
= ar
5
−
1
= ar
4
= 2 × (ar
n
−
1
)
4
= 2 ×
1
16
=
1
8
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