Series Completion - Definition, Types, Problems with Solutions
Practice Problems with Solutions:
Direction: In each of the following questions, a number series is given with one term missing. Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Q.1. 1, 9, 25, 49, ?, 121
(A) 64
(B) 81
(C) 91
(D) 100
Ans . B
The given series consist of squares of consecutive odd number i.e 12, 32, 52, 72, …….
So, missing term = 92 = 81.
Q.2. 4, 7, 12, 19, 28, ?
(A) 30
(B) 36
(C) 39
(D) 49
Ans . C
The pattern is +3, +5, +7, +9,……..
So missing term = 28 + 11 = 39.
Q.3. 11, 13, 17, 19, 23, 25, ?
(A) 26
(B) 27
(C) 29
(D) 37
Ans . C
The pattern is + 2, + 4, +2, +4, …..
So, missing term = 25 + 4 = 29.
Q.4. In the series 357, 363, 369, ……., what will be the 10th term ?
(A) 405
(B) 411
(C) 413
(D) 417
Ans . B
The given series is an A.P. in which a = 357 and d = 6.
⸫ 10th term = a + ( 10 – 1) d = a + 9d
= ( 357 + 9 × 6 ) = ( 357 + 54 ) = 411.
Hence, the answer is (b).
Directions: In each of the following questions, various terms of an alphabet series are given with one or more terms missing as shown by (?). Choose the missing terms out of the given alternatives.
Q.5. R, U, X, A, D, ?
(A) F
(B) G
(C) H
(D) I
Ans . B
Q.6. T, R, P, N, L, ?, ?
(A) J, G
(B) J, H
(C) K, H
(D) K, I
Ans . B
Q.7. B, D, F, I, L, P, ?
(A) R
(B) S
(C) T
(D) U
Ans . C
Directions: In each of the following questions, a letter-number series is given with one or more terms missing as shown by (?). Choose the missing term out of the given alternatives.
Q.8. D–4, F-6, H-8, J-10, ?, ?
(A) K-12, M-13
(B) L-12, M-14
(C) L-12, N-14
(D) K-12, M-14
Ans . C
The letters in the alternate and the numbers indicate their position in the English alphabet from the beginning
Q.9. 2B, 4C, 8E, 14H, ?
(A) 16K
(B) 20I
(C) 20L
(D) 22L
Ans . D
Q.10. 3F, 6G, 11I, 18L, ?
(A) 21O
(B) 25N
(C) 25P
(D) 27P
(E) 27Q
Ans . D
If you have any concern about this topic, you can ask me anything in the comment section. For practice with solutions, go to the next page.
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Vikram Singh
Providing knowledgable questions of Reasoning and Aptitude for the competitive exams.
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