Chapter 5
5.4
N
UMBER
S
ERIES
Prime Number Series
Example 1:
2, 3, 5, 7, 11, 13, 17, …
(a) 15
(b) 17
(c) 18
(d) 19
Solution:
The given series is a prime number series. The
next prime number is 19.
Therefore, (d) is the correct answer.
Example 2:
2, 5, 11, 17, 23, 31, …
(a) 33
(b) 37
(c) 41
(d) 43
Solution:
The prime numbers in this range are 2, 3, 5, 7,
11, 13, 17, 19, 23, 29, 31, 37, 41, 43, … .
Prime numbers have been written alternatively. Thus,
after 31, the prime numbers are 37, 41, … . Ignoring 37,
the answer is 41.
Therefore, (c) is the correct answer.
Difference Series
Example 3:
2, 5, 8, 11, 14, 17, …, ...
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