# Number series questions – Odd Man Out and Series – Odd Man Out

20 questions on “Number series questions – Odd Man Out and Series – Odd Man Out” where you have to find odd number amongst the given number list or series.

You have to identify the odd number out of the series or given numbers.

Other Similar Articles:

Odd Man out: Part – I | Part II.

## Questions Section

Que (1): 1, 3, 5, 11, 13, 17, 21
A. 3
B. 21
C. 13
D. 5

Reason: Every other number is a prime number except 21, it is divisible by 3.

Que (2): 1, 4, 12, 16, 25, 36, 49, 64
A. 12
B. 16
C. 4
D. 64

Reason: Every other number is a perfect square except 12, it lies between square of 3 and 4 i.e. 9 and 16 respectively.

Que (3): 1, 8, 17, 27, 64, 125, 216, 343, 512
A. 1
B. 8
C. 216
D. 17

Reason: Every other number is a perfect cube except 17, it lies between cube of 2 and 3 i.e. 8 and 27 respectively.

Que (4): 1, 7, 9, 14, 17, 21, 31
A. 1
B. 9
C. 14
D. 33

Reason: Every other number is odd except 12, it is divisible by 2 and hence it is an even number.

Que (5): 0, 3, 8, 15, 24, 35, 47
A. 0
B. 35
C. 47
D. 24

Reason: The calculation to get the following numbers is 1*1-1, 2*2-1 and so on. 47 is not following this pattern.

Que (6): 18, 45, 36, 65, 81, 108
A. 18
B. 65
C. 45
D. 108

Reason: Every number is divisible by 9 except 65.

Que (7): 16, 43, 25, 36, 25, 70, 61
A. 25
B. 70
C. 36
D. 16

Reason: In every other combination the sum of two digits is 7.

Que (8): 0, 7, 22, 63, 124, 215, 342, 511
A. 22
B. 0
C. 7
D. 63

Reason: The calculation to get the following numbers is 1*1*1-1, 2*2*2-1 and so on i.e. cube of a number minus 1.

Que (9): 78, 52, 39, 104, 119, 91
A. 78
B. 52
C. 91
D. 119

Reason: All the numbers are divisible by 13 except 119 i.e. 13 table is like: 13, 26, 39, 52, 65, 78, 91, 104, 117, 130, 143, 156 and so on.

Que (10): 2, 6, 12, 19, 30, 42, 56, 72
A. 19
B. 42
C. 6
D. 30

Reason: Answer is 1*1 + 1, 2*2 + 2, 3*3 + 3 and so on, hence the odd one out is 22 i.e. square of a number plus same number.

Que (11): 99, 126, 135, 153, 159, 162
A. 99
B. 159
C. 126
D. 162

Reason: All the numbers are divisible by 9 except 159.
Table of 9 is 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135, 144, 153, 162, 171, 180 and so on.

Que (12): 362, 263, 242, 482, 441, 555
A. 482
B. 441
C. 242
D. 555

Reason: Except 555 in all the other numbers the middle one is the product of the other two numbers i.e. 2*3=6 in case of 1st two numbers, 2*2=4 in case of 4rd number and so on.

Que (13): 253, 352, 462, 441, 594, 484, 242
A. 253
B. 441
C. 242
D. 484

Reason: Except 441 in all the other numbers the middle one is the sum of the other two numbers i.e. 2+3=5, 4+2=6 and so on.

Que (14): 213, 347, 257, 235, 448, 459, 594
A. 235
B. 594
C. 257
D. 448

Reason: Except 594 in all the other numbers the middle one is the difference of the last and the first number i.e. 3-2=1, 7-3=4 and so on.

Que (15): 110, 210, 215, 666, 665, 115
A. 665
B. 115
C. 666
D. 110

Reason: Except 666 all the numbers are divisible by 5.

Que (16): 1, 16, 81, 100, 625, 2401, 4096
A. 2401
B. 1
C. 4096
D. 100

Reason: Except 100 all the numbers are numbers raise to the power 4 in series i.e. 1^4 = 1, 2^4 = 16, 3^4 = 81 and so on.

Que (17): 2, 6, 8, 14, 18, 21, 32, 48, 64, 88
A. 8
B. 14
C. 18
D. 21

Reason: Except 21 every other number is an even number i.e. be it 8, 14, 48, 64 and so on.

Que (18): 3, 6, 8, 36, 18, 21, 33, 42
A. 6
B. 8
C. 42
D. 21

Reason: Except 8 every other number is a multiple of 3 i.e. be it 3, 6, 21, 33, 42 etc.

Que (19): 414, 255, 222, 117, 200, 1011
A. 414
B. 255
C. 200
D. 117

Reason: Except 200 every other number is divisible by 3.

Que (20): 21, 111, 102, 300, 201, 300, 2001, 200
A. 21
B. 111
C. 201
D. 200