Verbal Reasoning - Series Completion

In this type of questions, one term in the number series is wrong. Find out the wrong term.

1. 

121, 143, 165, 186, 209

A. 143
B. 165
C. 186
D. 209

Answer: Option C

Explanation:

Each term in the series is obtained by adding 22 to the preceding term.

So, 186 is wrong and must be replaced by (165 + 22) i.e. 187.


2. 

6, 15, 35, 77, 165, 221

A. 35
B. 77
C. 165
D. 15

Answer: Option C

Explanation:

The terms of the series are products of two consecutive prime numbers i.e. (2 x 3),

(3 x 5), (5 x 7), (7 x 11),.....

So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.


3. 

8, 13, 21, 32, 47, 63, 83

A. 13
B. 21
C. 32
D. 47

Answer: Option D

Explanation:

The correct pattern is + 5, + 8, + 11, + 14,.....

So, 47 is wrong and must be replaced by (32 + 14) i.e. 46.


4. 

1, 2, 4, 8, 16, 32, 64, 96

A. 4
B. 32
C. 64
D. 96

Answer: Option D

Explanation:

Each term of the series is obtained by multiplying the preceding term by 2.

So, 96 is wrong and must be replaced by (64 x 2) i.e. 128.


5. 

3, 4, 10, 32, 136, 685, 4116

A. 10
B. 32
C. 136
D. 4116

Answer: Option B

Explanation:

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

So, 32 is wrong and must be replaced by (10 x 3 + 3) i.e. 33.


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