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.
11. 

46080, 3840, 384, 48, 24, 2, 1

A. 1
B. 2
C. 24
D. 384

Answer: Option C

Explanation:

The terms are successively divided by 12, 10, 8, 6, ...etc.

So, 24 is wrong, it should be 8 (48/6 = 8).


12. 

6, 13, 18, 25, 30, 37, 40

A. 25
B. 30
C. 37
D. 40

Answer: Option D

Explanation:

The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.

So, 40 is wrong.


13. 

36, 54, 18, 27, 9, 18.5, 4.5

A. 4.5
B. 18.5
C. 54
D. 18

Answer: Option B

Explanation:

The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.

14. 

56, 72, 90, 110, 132, 150

A. 72
B. 110
C. 132
D. 150

Answer: Option D

Explanation:

The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13.

So, 150 is wrong.


15. 

25, 36, 49, 81, 121, 169, 225

A. 36
B. 49
C. 121
D. 169

Answer: Option A

Explanation:

The numbers are squares of odd natural numbers, starting from 5 up to 15.

So, 36 is wrong.


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