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Number Series Completion - General Inteligence & Reasoning MCQ Questions and Answers

Learn Number Series Completion mcq questions and answers with easy and logical explanations - Number Series Completion is part of competitive reasoning mcq questions. Page-3 section-3

Each section contains 100 MCQs on Number Series Completion .
21
Find out the wrong term: 1, 5, 9, 15, 25, 37, 49
Discuss
Answer & Solution
Answer: Option B
Solution:
The terms of the given series are 12 , (22 + 1), 32 , (42 + 1), 52 , (62 + 1), 72
So, 15 is wrong and must be replaced by (42 + 1) i.e., 17.
22
Find out the wrong term: 445, 221, 109, 46, 25, 11, 4
Discuss
Answer & Solution
Answer: Option B
Solution:
3 is subtracted from each number and the result divided by 2 to obtain the next number of the series,
So, 46 is wrong and must be replaced by (109 - 3)/2 i.e., 53.
23
Find out the wrong term: 11, 5, 20, 12, 40, 26, 74, 54
Discuss
Answer & Solution
Answer: Option C
Solution:
The given sequence is a combination of two series:
I: 11, 20, 40, 74 and
II: 5, 12, 26, 54
The correct pattern in I: is + 9, + 18, + 36,.....
So, 40 is wrong and must be replaced by (20 + 18) i.e., 38.
24
Find out the wrong term: 93, 309, 434, 498, 521, 533
Discuss
Answer & Solution
Answer: Option D
Solution:
The correct pattern is + 63 , + 53 , + 43 , + 33 , ............
So, 521 is wrong and must be replaced by (498 + 33 ) i.e., 525.
25
Find out the wrong term: 1, 5, 5, 9, 7, 11, 11, 15, 12, 17
Discuss
Answer & Solution
Answer: Option B
Solution:
The given sequence is a combination of two series :
I: 1, 5, 7, 11, 12 and
II: 5, 9, 11, 15, 17
The pattern in both I and II is + 4, + 2, + 4, + 2,

So, 12 is wrong and must be replaced by (11 + 2) i.e., 13.
26
Find out the wrong term: 1, 3, 12, 25, 48
Discuss
Answer & Solution
Answer: Option C
Solution:
The terms of the series are (12 - 0), (22 - 12 ), (42 - 22 ), (62 - 32 ), and (82 - 42 ),
So, 25 is wrong and must be replaced by (62 - 32) i.e., 27.
27
Find out the wrong term: 2, 3, 4, 4, 6, 8, 9, 12, 16
Discuss
Answer & Solution
Answer: Option C
Solution:
The given sequence is a combination of three series:
I: 1st, 4th, 7th terms i.e., 2, 4, 9.....
II: 2nd, 5th, 8th terms i.e.,3, 6, 12.......
III: 3rd, 6th, 9th terms i.e., 4, 8, 16..................
In each one of I, II and III, each term is twice the preceding term.
So, 9 is wrong and must be replaced by (4 × 2) i.e., 8.
28
Find out the wrong term: 3, 2, 8, 9, 13, 22, 18, 32, 23, 42
Discuss
Answer & Solution
Answer: Option B
Solution:
The given sequence is a combination of two series:
I: 3, 8, 13, 18, 23 and
II: 2, 9, 22, 32, 42
The pattern in I: is + 5, and the pattern in II: is + 10
So, in II, 9 is wrong and must be replaced by (2 + 10) i.e., 12.
29
Find out the wrong term: 1236, 2346, 3456, 4566, 5686
Discuss
Answer & Solution
Answer: Option D
Solution:
The correct pattern in the series is + 1110.
So, 5686 is wrong and must be replaced by (4566 + 1110) i.e., 5676.
30
In a given series one term is wrong or missing term: 1, 5, 14, 30, 55, 93
Discuss
Answer & Solution
Answer: Option C
Solution:
The correct pattern is + 4, + 9, + 16, + 25,+ 36 i.e., + 22, + 32 , + 42 , + 52 , + 62
So, 93 is wrong and must be replaced by (55 + 36) i.e., 91.