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Aptitude - Odd Man Out and Series

Exercise : Odd Man Out and Series - Pick Wrong No.
Directions to Solve
Find out the wrong number in the given sequence of numbers.
11.
46080, 3840, 384, 48, 24, 2, 1
1
2
24
384
Answer: Option
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
25
30
37
40
Answer: Option
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
4.5
18.5
54
18
Answer: Option
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
72
110
132
150
Answer: Option
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
36
49
121
169
Answer: Option
Explanation:

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

So, 36 is wrong.

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