Practice MCQ Questions and Answer on Number Series Completion

9, 16, 23, 30, 37, 44, 51, ... choose which pair of numbers comes next?

(A) 59, 66
(B) 56, 62
(C) 58, 66
(D) 58, 65

Solution:

 Here is a simple addition series, which begins with 9 and adds 7.

70, 71, 76, __, 81, 86, 70, 91. What number should fill the blank?

(A) 70
(B) 71
(C) 80
(D) 96

Solution:

 In this series, 5 is added to the previous number; the number 70 is inserted as every third number.

22, 21, 23, 22, 24, 23, ... What number should come next?

(A) 22
(B) 24
(C) 25
(D) 26

Solution:

 In this simple alternating subtraction and addition series; 1 is subtracted, then 2 is added, and so on.

Find the missing term: 2, 2, 5, 13, 28, ?

(A) 49
(B) 50
(C) 51
(D) 52

Solution:

 The pattern is + 0, + 3, + 8, + 15,.............i.e.,+ (12 - 1) , + (22 - 1), + (32 - 1), + (42 - 1),................ So, the missing term = 28 + (52 - 1) = 28 + 24 = 52

Find out the wrong term: 5, 27, 61, 122, 213, 340, 509

(A) 27
(B) 61
(C) 122
(D) 509

Solution:

 The terms of the series are (23 - 3), (33 - 3), (43 - 3), (53 - 3), (63 - 3), (73 -3), (83 -3). So, 27 is wrong and must be replaced (33 - 3) i.e., 24

Find the missing term: 1, 2, 6, 7, 21, 22, 66, 67, ?

(A) 70
(B) 134
(C) 201
(D) 301

Solution:

 The pattern is + 1, × 3, + 1, × 3, + 1, × 3, + 1,............. So, missing term = 67 × 3 = 201

664, 332, 340, 170, ____, 89. What number should fill the blank?

(A) 85
(B) 97
(C) 109
(D) 178

Solution:

 This is an alternating division and addition series: First, divide by 2, and then add 8.

Find out the wrong term: 11, 5, 20, 12, 40, 26, 74, 54

(A) 5
(B) 20
(C) 40
(D) 26

Solution:

 The given sequence is a combination of two series:I: 11, 20, 40, 74 and II: 5, 12, 26, 54The correct pattern in I: is + 9, + 18, + 36,.....So, 40 is wrong and must be replaced by (20 + 18) i.e., 38.

28, 25, 5, 21, 18, 5, 14, ... choose which pair of numbers comes next?

(A) 11, 5
(B) 10, 7
(C) 11, 8
(D) 5, 10

Solution:

 This is an alternating subtraction series with the interpolation of a random number, 5, as every third number. In the subtraction series, 3 is subtracted, then 4, then 3, and so on.

10.

Find the missing term: 1, 2, 3, 6, 9, 18, ?, 54

(A) 18
(B) 27
(C) 36
(D) 81

Solution:

 The pattern is × 2, × 3/2, × 2, × 3/2, × 2,.............So, missing term = 18 × 3/2 = 27

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Practice MCQ Questions and Answer on Number Series Completion

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