Practice MCQ Questions and Answer on Number Series Completion
211.
Find the missing term: 2, 7, 27, 107, 427, ?
(A) 1262
(B) 1707
(C) 4027
(D) 4207
Solution:
The pattern is +5, +20, +80, +320 i.e. +(5 × 12 ), +(5 × 22 ), +(5 × 42 ), +(5 × 82 ) So, missing term = 427 + +(5 × 162 ) = 427 +1280 = 1707
212.
17, 14, 14, 11, 11, 8, 8, ... choose which pair of numbers comes next?
(A) 8, 5
(B) 5, 2
(C) 8, 2
(D) 5, 5
Solution:
This is a simple addition series with repetition. It subtracted 3 to each number to arrive at the next, which is repeated before 3 is subtracted again.
213.
61, 57, 50, 61, 43, 36, 61, ... choose which pair of numbers comes next?
(A) 29, 61
(B) 27, 20
(C) 31, 61
(D) 22, 15
Solution:
Answer & Solution Answer: Option E Solution: This is an alternating repetition series, in which a random number, 61, is interpolated as every third number into an otherwise simple subtraction series. Starting with the second number, 57, each number (except 61) is 7 less than the previous number.
214.
VI, 10, V, 11, __, 12, III. What number should fill the blank?
(A) II
(B) IV
(C) IX
(D) 14
Solution:
This is an alternating addition and subtraction series. Roman numbers alternate with Arabic numbers. In the Roman numeral pattern, each number decreases by 1. In the Arabic numeral pattern, each number increases by 1.
215.
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
216.
Find the missing term : 1, 0, 3, 2, 5, 6, ?, 12, 9, 20
(A) 9
(B) 10
(C) 7
(D) 8
Solution:
There are two series in the given question. 1st series: 1, 3, 5, 7, 9 ... ( each next term are generated by adding 2) 2nd series: 0, 2, 6, 12, 20 ... ( each next term are generated by adding 2n [where n=1,2,3,4...])
217.
34, 45, 56, 67, ....... What number should come next?
(A) 78
(B) 73
(C) 82
(D) 84
Solution:
34(+11) → 45(+11) → 56(+11) →67 (+11) → 78.
218.
Find the missing term: 2, 5, 9, ?, 20, 27
(A) 14
(B) 16
(C) 18
(D) 24
Solution:
The pattern is +3, +4, +5, +6,........So, missing term=9+5=14
219.
Find the missing term :9*2 : 9*9 : : 9*5 : ?
(A) 9*4
(B) 9*6
(C) 9*7
(D) 9*8
Solution:
9 × 2 : 9 × 9 : : 9 × 5 : ?18 : 81 : : 45 : 9 × 6 So. 9 × 6 will come in place of question mark.
220.
8, 12, 9, 13, 10, 14, 11, ... choose which pair of numbers comes next?
(A) 14, 11
(B) 15, 12
(C) 8, 15
(D) 15, 19
Solution:
This is an alternating addition and subtraction series, in which the addition of 4 is alternated with the subtraction of 3.