Practice MCQ Questions and Answer on Series Completion
201.
2, 3 ,8 , 27, 112, ?
(A) 226
(B) 339
(C) 452
(D) 565
Solution:
The pattern is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4,..... So, missing term = 112 x 5 + 5 = 565.
202.
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
203.
2, 3, 5,7,11,?, 17
(A) 12
(B) 13
(C) 14
(D) 15
Solution:
Clearly, the given series consists of prime numbers starting from 2. So, the missing term is the prime number after 11, which is 13.
204.
Choose the missing terms out of the given alternatives : b e d f ? h j ? l
(A) i m
(B) m i
(C) i n
(D) j m
Solution:
The series may be divided into groups as shown:b e d / f ? h / j ? lClearly in the first group, the second group and third group , letters are respectively three and two steps ahead of the first letter. A similar pattern would follow in the second and third groups.
205.
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
Solution:
Z - 6 T - 6 N - 6 H - 6 BZ -3 W - 3 T - 3 Q- 3 N - 3 K - 3 H - 3 E - 3 B
206.
Choose the missing terms out of the given alternatives : A, CD, GHI, ? , UVWXY
(A) LMOP
(B) MNO
(C) MNOP
(D) NOPQ
Solution:
Each term consists of consecutive letters in order. The number of letters in the terms goes on increasing by one at each steps. Also, there is a gap of one letter between the last letter of the first term and the first letter of the second term; a gap of two letters between the last letter of the second term and the first letter of the third term; and so on. So, there should be a gap of three letters between the last letter of the third term and the first letter of the desired term.
207.
One term in the number series is wrong. Find out the wrong term.
11, 5, 20, 12, 40, 26, 74, 54
(A) 5
(B) 20
(C) 40
(D) 26
Solution:
The given sequence is a combination of two series : I. 11, 20, 40, 74 and II. 5, 12, 26, 54 The correct pattern in I is + 9, + 18, + 36,..... So, 40 is wrong and must be replaced by (20 + 18) i.e. 38.
208.
Choose the missing terms out of the given alternatives.
AI, BJ, CK, ?
(A) DL
(B) DM
(C) GH
(D) LM
209.
24, 60, 120, 210, ?
(A) 300
(B) 336
(C) 420
(D) 525
Solution:
The pattern is + 36, + 60, + 90,.....i.e. + [6 x (6 + 0)], + [6 x (6 + 4)], + [6 x (6 + 9)],... So, missing term = 210 + [6 x (6 + 15)] = 210 + 126 = 336.
210.
2, 2, 5,13, 28, ?
(A) 49
(B) 50
(C) 51
(D) 52
Solution:
The pattern is + 0, + 3, + 8, + 15, ..... i.e. + (l2 - 1), + (22 - 1), + (32 - 1), + (42 - 1), ..... So, missing term = 28 + (52 - 1) = 28 + 24 = 52.