Aptitude - Odd Man Out and Series

Exercise :: Odd Man Out and Series - Pick Wrong No.

Find out the wrong number in the given sequence of numbers.
6. 

52, 51, 48, 43, 34, 27, 16

A. 27
B. 34
C. 43
D. 48

Answer: Option B

Explanation:

Subtract 1, 3, 5, 7, 9, 11 from successive numbers.

So, 34 is wrong.


7. 

4, 6, 8, 9, 10, 11, 12

A. 10
B. 11
C. 12
D. 9

Answer: Option B

Explanation:

Each number is a composite number except 11.


8. 

105, 85, 60, 30, 0, -45, -90

A. 0
B. 85
C. -45
D. 60

Answer: Option A

Explanation:

Subtract 20, 25, 30, 35, 40, 45 from successive numbers.

So, 0 is wrong.


9. 

5, 16, 6, 16, 7, 16, 9

A. 9
B. 7
C. 6
D. None of these

Answer: Option A

Explanation:

Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.

So, 9 is wrong.


10. 

125, 127, 130, 135, 142, 153, 165

A. 130
B. 142
C. 153
D. 165

Answer: Option D

Explanation:

Prime numbers 2, 3, 5, 7, 11, 13 are to be added successively.

So, 165 is wrong.