Practice MCQ Questions and Answer on Series Completion
91.
One term in the number series is wrong. 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 and II. 2, 9, 22, 32, 42 The 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.
92.
Choose the missing terms out of the given alternatives.
ATTRIBUTION, TTRIBUTIO, RIBUTIO, IBUTI, ?
(A) IBU
(B) UT
(C) UTI
(D) BUT
Solution:
In the first step, one letter from the beginning and one from the end of a term are removed to give the next term. In the second step, two letters from the beginning of a term are removed. These two steps are repeated alternately.
93.
20, 20, 19, 16, 17, 13, 14, 11, ?, ?
(A) 10, 10
(B) 10, 11
(C) 13, 14
(D) 13, 16
Solution:
Let the missing terms of the series be x1 and x2. Thus, the sequence 20, 20, 19, 16, 17, 13, 14, 11, xv x2 is a combination of two series : I. 20, 19, 17, 14, x1 and II. 20, 16, 13, 11, x2 The pattern in I is - 1, - 2, - 3,......So, missing term, x1 = 14 - 4 = 10. The pattern in II is - 4, - 3, - 2,......So, missing term, x2 = 11 - 1 = 10.
94.
One term in the number series is wrong. Find out the wrong term.
105, 85, 60, 30, 0, - 45, - 90
(A) 105
(B) 60
(C) 0
(D) -45
Solution:
The correct pattern is - 20, - 25, - 30,..... So, 0 is wrong and must be replaced by (30 - 35) i.e. - 5.
95.
Choose the missing terms out of the given alternatives.
AZ, GT, MN, ?, YB
(A) JH
(B) SH
(C) SK
(D) TS
96.
One term in the number series is wrong. Find out the wrong term.
24576, 6144, 1536, 386, 96, 24
(A) 96
(B) 386
(C) 1536
(D) 6144
Solution:
Each term of the series is obtained by dividing the preceding term by 4. So, 1536 is wrong and must be replaced by (1536 + 4) i.e. 384.
97.
Choose the missing terms out of the given alternatives : T, R, P, N, L , ?, ?
(A) J, G
(B) J, H
(C) K, H
(D) K, I
Solution:
T - 2 = R - 2 = P - 2 = N - 2 = L - 2 = J - 2 = H
98.
One term in the number series is wrong. Find out the wrong term.
1236, 2346, 3456, 4566, 5686
(A) 1236
(B) 3456
(C) 4566
(D) 5686
Solution:
The correct pattern in the series is + 1110. So, 5686 is wrong and must be replaced by (4566 + 1110) i.e. 5676.
99.
6, 18, 3, 21, 7, 56, ?
(A) 8
(B) 9
(C) 63
(D) 64
Solution:
Each term at an even place in the series is the product of its two adjacent terms. Thus, if the missing term be x, then we have : 7 x x = 56 or x = 56 ÷ 7 = 8.
100.
One term in the number series is wrong. 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.