Practice MCQ Questions and Answer on Series Completion
1.
Choose the missing terms out of the given alternatives.
U, B, I, P, W, ?
(A) D
(B) F
(C) Q
(D) Z
2.
4, 12, 36, 108, ?
(A) 144
(B) 216
(C) 304
(D) 324
Solution:
The pattern is x 3. So, missing term = 108 x 3 = 324.
3.
Choose the missing terms out of the given alternatives : Y, W, T, P, K, E, X, ?, ?
(A) G, H
(B) P, G
(C) R, G
(D) S, R
Solution:
Y - 2 = W - 3 = T - 4 = P - 5 = K - 6 = E - 7 = X - 8 = P - 9 = G
4.
1, 1, 2, 6, 24, ?, 720
(A) 100
(B) 104
(C) 108
(D) 120
Solution:
The pattern is x 1, x 2, x 3, x 4,..... So, missing term = 24 x 5 = 120.
5.
One term in the number series is wrong. Find out the wrong term.
15, 16, 22, 29, 45, 70
(A) 16
(B) 22
(C) 45
(D) 70
Solution:
The correct pattern is + 1, + 4, + 9, + 16, + 25 i.e. + 12, + 22, + 32, + 42, + 52. So, 22 is wrong and must be replaced by (16 + 4) i.e. 20.
6.
One term in the number series is wrong. Find out the wrong term.
2, 3, 4, 4, 6, 8, 9, 12, 16
(A) 3
(B) 6
(C) 9
(D) 12
Solution:
The given sequence is a combination of three series: I. 1st, 4th, 7th terms i.e. 2, 4, 9,..... II. 2nd, 5th, 8th terms i.e. 3, 6, 12,..... III. 3rd, 6th, 9th terms i.e. 4, 8, 16,..... In each one of I, II and III, each term is twice the preceding term. So, 9 is wrong and must be replaced by (4 x 2) i.e. 8.
7.
589654237, 89654237, 8965423, 965423, ?
(A) 58965
(B) 65423
(C) 89654
(D) 96542
Solution:
The digits are removed one by one from the beginning and the end in order alternately so as to obtain the subsequent terms of the series.
8.
Choose the missing terms out of the given alternatives : A, B, B, D, C, F, D, D, H. E, ?, ?
(A) E, F
(B) F, G
(C) F, I
(D) J, F
Solution:
The given sequence is a combination of two series:I: 1st , 3rd, 5th, 7th, 9th, 11th terms i.e., A, B, C, D, E, ?II: 2nd, 4th, 6th, 8th, 10th terms i.e., B, D, F, H, ?Clearly , I: consists of consecutive letters while II: consists of alternate letters. So, the missing letter in I is F, while that in II is J.So, the missing terms i.e., 10th and 11th terms re J and F respectively.
9.
Choose the missing terms out of the given alternatives.
Z, ?, T, ?, N, ?, H, ?, B
(A) W, Q, K, E
(B) W, R, K, E
(C) X, Q, K, E
(D) X, R, K, E
10.
One term in the number series is wrong. 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.