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.

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Part – VI	Part – VII	Part – VIII	Part – IX	Part – X

Odd Man out: Part – I | Part II.

Questions Section

S. No.	Series	Answer / Reason
1	1, 3, 5, 11, 13, 17, 21	Every other number is a prime number except 21, it is divisible by 3.
2	1, 4, 12, 16, 25, 36, 49, 64	Every other number is a perfect square except 12, it lies between square of 3 and 4 i.e. 9 and 16 respectively.
3	1, 8, 17, 27, 64, 125, 216, 343, 512	Every other number is a perfect cube except 17, it lies between cube of 2 and 3 i.e. 8 and 27 respectively.
4	1, 7, 9, 14, 17, 21, 31	Every other number is odd except 12, it is divisible by 2 and hence it is an even number.
5	0, 3, 8, 15, 24, 35, 47	The calculation to get the following numbers is 1*1-1, 2*2-1 and so on. 47 is not following this pattern.
6	18, 45, 36, 65, 81, 108	Every number is divisible by 9 except 65.
7	16, 43, 25, 36, 25, 70, 61	In every other combination the sum of two digits is 7 except 36.
8	0, 7, 22, 63, 124, 215, 342, 511	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. So, 22 is the odd one.
9	78, 52, 39, 104, 119, 91	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.
10	2, 6, 12, 19, 30, 42, 56, 72	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.
11	99, 126, 135, 153, 159, 162	All the numbers are divisible by 9 except 159.
12	362, 263, 242, 482, 441, 555	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.
13	253, 352, 462, 441, 594, 484, 242	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.
14	213, 347, 257, 235, 448, 459, 594	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.
15	110, 210, 215, 666, 665, 115	Except 666 all the numbers are divisible by 5.
16	1, 16, 81, 100, 625, 2401, 4096	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.
17	2, 6, 8, 14, 18, 21, 32, 48, 64, 88	Except 21 every other number is an even number i.e. be it 8, 14, 48, 64 and so on.
18	3, 6, 8, 36, 18, 21, 33, 42	Except 8 every other number is a multiple of 3 i.e. be it 3, 6, 21, 33, 42 etc.
19	414, 255, 222, 117, 200, 1011	Except 200 every other number is divisible by 3.
20	21, 111, 102, 300, 201, 300, 2001, 200	Except 200 in every other number the sum is 3 of all the other digits.

Other relevant articles:

• Number Series Questions and Answers – I
• Number Series Questions and Answers – II
• Logical Reasoning / Number Series Questions and Answers – III
• Logical Reasoning / Number Series Questions and Answers – IV
• Logical Reasoning / Number Series Questions and Answers – V

Conclusion

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