series completion verbal reasoning questions

By /
Directions to Solve

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

16. 2, 6, 24, 96, 285, 568, 567
A. 6 B. 24
C. 285 D. 567

Answer: Option B

Explanation:

 

The correct pattern is x 6 – 6, x 5 – 5, x 4 – 4,…..

So, 24 is wrong and must be replaced by (6 x 5 – 5) i.e. 25.
17. 3, 2, 8, 9, 13, 22, 18, 32, 23, 42
A. 8 B. 9
C. 13 D. 22

Answer: Option B

Explanation:

 

The given sequence is a combination of two series:

I. 3, 8, 13, 18, 23 and II. 2, 9, 22, 32, 42

The pattern in I is + 5, and the pattern in II is + 10. So, in II, 9 is wrong and must be replaced by (2 + 10) i.e. 12.
18. 196, 169, 144, 121, 101
A. 101 B. 121
C. 169 D. 196

Answer: Option A

Explanation:

 

The sequence is (14)2, (13)2, (12)2, (11)2, (10)2.

So, 101 is wrong and must be replaced by (10)2 i.e. 100.
19. 56, 58, 62, 70, 84, 118, 182
A. 58 B. 62
C. 84 D. 118

Answer: Option C

Explanation:

 

The correct pattern is + 2, + 4, + 8, + 16, + 32, + 64 i.e. + 2, + 22, + 23, + 24, + 25, + 26.

So, 84 is wrong and must be replaced by (70 + 16) i.e. 86.
20. 1, 5, 5, 9, 7, 11, 11, 15, 12, 17
A. 11 B. 12
C. 17 D. 15

Answer: Option B

Explanation:

 

The given sequence is a combination of two series:

I. 1, 5, 7, 11, 12 and II. 5, 9, 11, 15, 17

The pattern in both I and II is + 4, + 2, + 4, + 2. So, 12 is wrong and must be replaced by (11 + 2) i.e. 13.