Practice MCQ Questions and Answer on Number Series Completion
141.
Find the missing term: 4/9, 9/20, ? , 39/86
(A) 17/40
(B) 19/42
(C) 20/45
(D) 29/53
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 .
142.
Which of the following will come in place of the question mark (?) in the following sequence?
PRODUCTIVITY, RODUCTIVIT, ODUCTIVI, ?
(A) DUCTIV
(B) DUCTLY
(C) UCTIV
(D) DUCTI
Solution:
PRODUCTIVITY = RODUCTIVIT.(First and last letters are removed.) RODUCTIVIT = ODUCTIVI. ODUCTIVI = DUCTIV.
143.
Find the missing term: 5, 2, 7, 9, 16, 25, ?
(A) 41
(B) 45
(C) 48
(D) 52
Solution:
Each term in the series, except the first two terms, is the sum of the preceding two terms.So, missing term = 16 + 25 = 41
144.
What will come at the place of question mark ? 5760,2880,960, 240, 48, ?
(A) 6
(B) 8
(C) 12
(D) 16
Solution:
First Term = 5760. Second term = 5760 /2 = 2880. Third Term = 2880/3 = 960. Fourth term = 960/4 = 240. Fifth term = 240/5 = 48. So, Required term = 48/6 = 8.
145.
Find the missing term: 22, 24, 28, ?, 52, 84
(A) 36
(B) 38
(C) 42
(D) 46
Solution:
The pattern is + 2, + 4, + 8, +16,............ So, the missing term = 28 + 8 = 36
146.
Find out the wrong term: 1, 2, 4, 8, 16, 32, 64, 96,
(A) 4
(B) 32
(C) 64
(D) 96
Solution:
Each term of the series is obtained by multiplying the preceding term by 2.So, 96 is wrong and must be replaced by (64 × 2) i.e., 128.
147.
Find the missing term: 10, 18, 28, 40, 54, 70, ?
(A) 85
(B) 86
(C) 87
(D) 88
Solution:
The pattern is +8, +10, +12, +14,........So, missing term=70+18=88
148.
4, 8, 22, 12, 16, 22, 20, 24, ... choose which pair of numbers comes next?
(A) 28, 32
(B) 28, 22
(C) 22, 28
(D) 32, 36
Solution:
This is an alternating repetition series, with a random number, 22, interpolated as every third number into an otherwise simple addition series. In the addition series, 4 is added to each number to arrive at the next number.
149.
Find the missing term: 198, 194, 185, 169, ?
(A) 92
(B) 112
(C) 136
(D) 144
Solution:
The pattern is - 4, - 9, - 16,.....i.e., - 22, - 32 , - 42 ,.............. So, the missing term = 169 - 52 = 169 - 25 = 144
150.
31, 29, 24, 22, 17, ... What number should come next?
(A) 15
(B) 14
(C) 13
(D) 12
Solution:
This is a simple alternating subtraction series, which subtracts 2, then 5.