series completion verbal reasoning questions

12 years ago

pooja

1 minute

Directions to Solve

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

31.

66, 36, 18, ?
A. 3 B. 6
C. 8 D. 9
Answer & Explanation

Answer: Option C

Explanation:

Each term in the series is the product of the digits of the preceding term.

So, missing term = 1 x 8 = 8.

View Answer Workspace Report Discuss in Forum
32.

In the series 3, 9, 15, …… what will be the 21st term?
A. 117 B. 121
C. 123 D. 129
Answer & Explanation

Answer: Option C

Explanation:

Clearly, 3 + 6 = 9, 9 + 6 = 15,…..

So, the series is an A.P. in which a = 3 and d = 6.

Therefore 21st term = a + (21 – 1) d = a + 20d = 3 + 20 x 6 = 123.

View Answer Workspace Report Discuss in Forum
33.

28, 33, 31, 36, ?, 39
A. 32 B. 34
C. 38 D. 40
Answer & Explanation

Answer: Option B

Explanation:

The pattern is + 5, – 2, + 5, – 2,…..

So, missing term = 36 – 2 = 34.

View Answer Workspace Report Discuss in Forum
34.

1, 9, 25, 49, 81, ?
A. 100 B. 112
C. 121 D. 144
Answer & Explanation

Answer: Option C

Explanation:

The series consists of squares of consecutive odd numbers

i.e. 12, 32, 52, 72, 92,…..

So, missing term = 112 = 121.

View Answer Workspace Report Discuss in Forum
35.

1, 9, 25, 49, ?, 121
A. 64 B. 81
C. 91 D. 100
Answer & Explanation

Answer: Option B

Explanation:

The given series consists of squares of consecutive odd numbers

i.e. 12, 32, 52, 72,…..

So, missing term = 92 = 81.