Practice MCQ Questions and Answer on Number Series Completion
61.
20, 20, 17, 17, 14, 14, 11, ... choose which pair of numbers comes next?
(A) 8, 8
(B) 11, 11
(C) 11, 14
(D) 8, 9
Solution:
Answer & Solution Answer: Option E Solution: This is a simple subtraction with repetition series. It begins with 20, which is repeated, then 3 is subtracted, resulting in 17, which is repeated, and so on.
62.
Find out the wrong term: 121, 143, 165, 186, 209
(A) 143
(B) 165
(C) 186
(D) 209
Solution:
Each term in the series is obtained by adding 22 to the preceding term.So, 186 is wrong and must be replaced by (165 + 22) i.e., 187.
63.
9, 11, 33, 13, 15, 33, 17, ... choose which pair of numbers comes next?
(A) 19, 33
(B) 33, 35
(C) 33, 19
(D) 15, 33
Solution:
In this alternating repetition series, a random number, 33, is interpolated every third number into a simple addition series, in which each number increases by 2.
64.
(1/9), (1/3), 1, ____ , 9. What number should fill the blank?
(A) (2/3)
(B) 3
(C) 6
(D) 27
Solution:
This is a multiplication series; each number is 3 times the previous number.
65.
Find the missing term: 10, 100, 200, 310. ?
(A) 400
(B) 410
(C) 420
(D) 430
Solution:
The pattern is + 90, + 100, + 110...... So, the missing term = 310 + 120 = 430
66.
Find out the wrong term: 8, 13, 21, 32, 47, 63, 83
(A) 13
(B) 21
(C) 32
(D) 47
Solution:
The correct pattern is + 5, + 8, + 11, + 14, ............So, 47 is wrong and must be replaced by (32 + 14) i.e., 46
67.
13, 29, 15, 26, 17, 23, 19, ... choose which pair of numbers comes next?
(A) 21, 23
(B) 20, 21
(C) 20, 17
(D) 25, 27
Solution:
Here, there are two alternating patterns, with every other number following a different pattern. The first pattern begins with 13 and adds 2 to each number to arrive at the next; the alternating pattern begins with 29 and subtracts 3 each time.
68.
In a given series one term is wrong or missing term: 0, 3, 8, 15, 24, 33
(A) 8
(B) 15
(C) 26
(D) 33
Solution:
The correct pattern is + 3, + 5, + 7, + 9, + 11.So, 33 is wrong and must be replaced by (24 + 11) i.e., 35.
69.
40, 40, 31, 31, 22, 22, 13, ... choose which pair of numbers comes next?
(A) 13, 4
(B) 13, 5
(C) 4, 13
(D) 9, 4
Solution:
This is a subtraction series with repetition. Each number repeats itself and then decreases by 9.
70.
Find out the wrong term: 3, 2, 8, 9, 13, 22, 18, 32, 23, 42
(A) 8
(B) 9
(C) 13
(D) 22
Solution:
The given sequence is a combination of two series:I: 3, 8, 13, 18, 23 andII: 2, 9, 22, 32, 42The 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.