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.
1. 

582, 605, 588, 611, 634, 617, 600

A. 634
B. 611
C. 605
D. 600

Answer: Option A

Explanation:

Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.

2. 

22, 33, 66, 99, 121, 279, 594

A. 33
B. 121
C. 279
D. 594

Answer: Option C

Explanation:

Each of the number except 279 is a multiple of 11.

3. 

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

A. 47
B. 63
C. 32
D. 83

Answer: Option A

Explanation:

Go on adding 5, 8, 11, 14, 17, 20.

So, the number 47 is wrong and must be replaced by 46.


4. 

1, 8, 27, 64, 124, 216, 343

A. 8
B. 27
C. 64
D. 124

Answer: Option D

Explanation:

The numbers are 13, 23, 33, 43 etc. So, 124 is wrong; it must have been 53 i.e., 125.

5. 

1, 2, 6, 15, 31, 56, 91

A. 31
B. 91
C. 56
D. 15

Answer: Option B

Explanation:

1, 1 + 12 = 2, 2 + 22 = 6, 6 + 32 = 15, 15 + 42 = 31, 31 + 52 = 56, 56 + 62 = 92

Last number of given series must be 92 not 91.