series completion verbal reasoning questions

Directions to Solve

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

11.

7, 26, 63, 124, 215, 342, ?
A.     391    B.     421
C.     481    D.     511
Answer & Explanation

Answer: Option D

Explanation:

The terms of the given series are (23 – 1), (33 – 1), (43 – 1), (53 – 1), (63 – 1), (73 – 1),…..

So, missing term = (83 – 1) = (512 – 1) = 511.

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12.

3, 12,27,48, 75, 108,?
A.     147    B.     162
C.     183    D.     192
Answer & Explanation

Answer: Option A

Explanation:

The terms of the given series are 3 x l2, 3 x 22, 3 x 32, 3 x 42, 3 x 52, 3 x 62,…..

So, missing term = 3 x 72 = 3 x 49 = 147.

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13.

3, 7, 23, 95, ?
A.     62    B.     128
C.     479    D.     575
Answer & Explanation

Answer: Option C

Explanation:

The pattern is x 2 + 1, x 3 + 2, x 4 + 3,…..

So, missing term = 95 x 5 + 4 = 479.

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14.

6, 18, 3, 21, 7, 56, ?
A.     8    B.     9
C.     63    D.     64
Answer & Explanation

Answer: Option A

Explanation:

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.

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15.

4, 9, 25, ?, 121, 169, 289, 361
A.     49    B.     64
C.     81    D.     87
Answer & Explanation

Answer: Option A

Explanation:

The given series consists of squares of consecutive prime numbers

i.e. 22, 32, 52,…..,

11, 132, 172, 192.

So, missing term = 72 = 49.