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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-8 section-2

Each section contains 100 MCQs on Number Series Completion .
71
Find the missing term: 2, 12, 36, 80, 150, ?
Discuss
Answer & Solution
Answer: Option C
Solution:
The given series is a triangular pattern series.
So, we have
2       12       36       80     150     ?
     10       24       44       70
         14        20      26
              6           6
So, missing term
= 150 + (70 + 26 + 6)
= 150 + 102
= 252
72
Find the missing term: 625, 5, 125, 25, 25, ?, 5
Discuss
Answer & Solution
Answer: Option C
Solution:
The given sequence is a combination of two series:
I. 625, 125, 25, 5 and
II. 5, 25, ?
The pattern is ÷ 5, while that in II is × 5.
So, missing term = 25 × 5 = 125
73
Find the missing term: 2, 9, 28, ?, 126, 126, 217, 344
Discuss
Answer & Solution
Answer: Option B
Solution:
The given series is a triangular pattern series.
So, we have
Series I :  2     9     28     ?
                126   217    344
Series II :  7     19     ?
                ?   91    127
Series III :       12     ?     ?
                ?   36
Clearly, to form a pattern, the missing terms in Series III must be 18, 24, 30
So, missing term
= 127 + (61 + 24 + 6)
= 127 + 91
= 218
74
Find the missing term: 11, 10, ?, 100, 1001, 1000, 10001
Discuss
Answer & Solution
Answer: Option A
Solution:
The pattern is - 1, × 10 + 1, - 1, × 10 + 1, - 1, × 10 +1, ....
So, the missing term = 10 × 10 + 1 = 101
75
Which of the following will not be a number of the series 1, 8, 27, 64, 125, ....?
Discuss
Answer & Solution
Answer: Option A
Solution:
The given series consists of cubes of natural numbers only. 256 is not the cube of any natural number.
76
Find the missing term: 3, 4, 7, 7, 13, 13, 21, 22, 31, 34, ?
Discuss
Answer & Solution
Answer: Option B
Solution:
The given sequence is a combination of two series:
I. 3, 7, 13, 21, 31, ? and
II. 4, 7, 13, 22, 34
The pattern in I is + 4, + 6, + 8, + 10,......
The pattern in II is + 3, + 6, + 9, + 12,..............
So, missing term = 31 + 12 = 43
77
Find the missing term : 90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3
Discuss
Answer & Solution
Answer: Option A
Solution:
Clearly, 90 = 30 × 3, 180 = 6 × 30, 12 = 2 × 6, 50 = 25 × 2, 100 = 4 × 25, 200 = 50 × 4
So, missing term = 3 × 50 = 150
78
In the series 10, 17, 24, 31, 38,...... which of the following will be a number of the series ?
Discuss
Answer & Solution
Answer: Option B
Solution:
The given series consists of numbers each of which, on dividing by 7, leaves a remainder 3, No other number except 346 satisfies the property.
79
Find the missing term: 13, 32, 24, 43, 35, ?, 46, 65, 57, 76
Discuss
Answer & Solution
Answer: Option C
Solution:
The given sequence is a combination of two series:
I. 13, 24, 35, 46, 57 and
II. 32, 43, ?, 65, 76
The pattern in both I and II is + 11
So, missing term = 43 + 11 = 54
80
Find the missing term: 4/9, 9/20, ? , 39/86
Discuss
Answer & Solution
Answer: Option B
Solution:
The sequence in the numerators is + 5, + 10, + 20, ......and that in the denominators is + 11, + 22, + 44,............
So, the numerator of the missing fraction should be (9 + 10)i.e., 19 and the denominator should be (20 + 22)i.e., 42. Thus, the missing term is 19/42 .