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

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Solution

So, missing term = 92 = 81.

Q.2. 4, 7, 12, 19, 28, ?

(A) 30

(B) 36

(C) 39

(D) 49

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Solution

So missing term = 28 + 11 = 39.

Q.3. 11, 13, 17, 19, 23, 25, ?

(A) 26

(B) 27

(C) 29

(D) 37

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Solution

So, missing term = 25 + 4 = 29.

Q.4. In the series 357, 363, 369, ……., what will be the 10^th term ?

(A) 405

(B) 411

(C) 413

(D) 417

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Solution

⸫ 10^th 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

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Solution

Q.6. T, R, P, N, L, ?, ?

(A) J, G

(B) J, H

(C) K, H

(D) K, I

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Solution

Q.7. B, D, F, I, L, P, ?

(A) R

(B) S

(C) T

(D) U

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Solution

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

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Solution

Q.9. 2B, 4C, 8E, 14H, ?

(A) 16K

(B) 20I

(C) 20L

(D) 22L

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Solution

Q.10. 3F, 6G, 11I, 18L, ?

(A) 21O

(B) 25N

(C) 25P

(D) 27P

(E) 27Q

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Solution

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