Number series questions – Odd Man Out and Series – Odd Man Out – Part II

20 questions on “Number series questions – Odd Man Out and Series – Odd Man Out – Part II” 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.

Part one of this number series – odd man out series was already published on 12-Feb-2023 – do refer it for more such questions.

Other Similar Articles:

Part – I	Part – II	Part– III	Part – IV	Part – V
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	17, 21, 23, 29, 31, 37	In the series 21 is the answer as every other number is a prime number except 21, it is divisible by 3.
2	9, 4, 16, 22, 121, 144	Every other number is a perfect square except 22, it lies between square of 3 and 4 i.e. 9 and 16 respectively.
3	8, 64, 27, 60, 216, 512	Every other number is a perfect cube except 60, it lies between cube of 2 and 4 i.e. 8 and 64 respectively.
4	2, 6, 14, 17, 22, 38	Every other number is even except 17, it is not divisible by 2 and hence it is an odd number.
5	2, 5, 10, 15, 26, 37	The calculation to get the following numbers is 1*1 + 1 = 2, 2*2 + 1 = 5, 3*3 + 1 = 10, 5*5 + 1 = 26, 6*6 = 1 = 37 and so on. 15 is not following this pattern.
6	99, 117, 65, 198, 207	Every number is divisible by 9 except 65.
7	14, 23, 25, 32, 41, 50	1 + 4 = 5, 2 + 3 =5, 4 + 1 = 5, and so on. Reason: In every other combination the sum of two digits is 25.
8	-1, 2, 7, 14, 20, 23	The calculation to get the following numbers is 1*1 – 2 = -1, 2*2 – 2 = 2, 3*3 – 2 = 7, 4*4 – 2 = 14, 5*5 – 2 = 23, and so on. and so on i.e. square of a number minus 2.
9	39, 91, 143, 169, 188	All the numbers are divisible by 13 except 188 13*3 = 39, 13*7 = 91, 13*11 = 143, 13*13 = 169, and so on. i.e. 13 table is like: 13, 26, 39, 52, 65, 78, 91, 104, 117, 130, 143, 156 and so on.
10	3, 7, 12, 13, 21	Answer is 1*1 + 1 + 1 = 3, 2*2 + 2 + 1 = 7, 3*3 + 3 + 1 = 13, 4*4 + 4 + 1 = 21, and so on. and so on, hence the odd one out is 12 i.e. square of a number plus same number plus one.
11	27, 81, 144, 155, 162	All the numbers are divisible by 9 except 155. 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.
12	242, 122, 133, 331, 442, 263	Except 442 in all the other numbers the middle one is the product of the other two numbers i.e. 2*2 = 4, 1*2 = 2, 1*3 = 3, 2*3 = 6, and so on.
13	264, 165, 297, 441, 594	Except 441 in all the other numbers the middle one is the sum of the other two numbers i.e. 2 + 4 = 6, 1 + 5 = 6, 2 + 7 = 9, 5 + 4 = 9, and so on.
14	279, 369, 268, 235, 484	Except 484 in all the other numbers the middle one is the difference of the last and the first number i.e. 9 – 7 = 2, 9 – 3 = 6, 8 – 2 = 6, 5 – 2 = 3 and so on.
15	105, 235, 335, 441, 695	Except 441 all the numbers are divisible by 5 i.e. 105/5 = 21, 235/5 = 47, 335/5 = 67, 695/5 = 139, and so on.
16	-3, 12, 77, 100, 621	Except 100 all the numbers are numbers raise to the power 4 – 4 in series i.e. 1^4 – 4 = -3, 2^4 – 4 = 12, 3^4 – 4 = 77, 5^4 – 4 = 621 and so on.
17	42, 62, 88, 144, 211, 338	Except 211 every other number is an even number i.e. 42/2 = 21, 62/2 = 31, 88/2 = 44, 144/2 = 72, 338/2 = 179 and so on.
18	21, 120, 147, 201, 332	Except 332 every other number is a multiple of 3 i.e. 21/3 = 7, 120/3 = 40, 147/3 = 49, 201/3 = 67 and so on.
19	4, 21, 13, -8, 44	Except -8 every other number is positive i.e. >0.
20	-2, -111, 102, -91, -101	Except 102 every other number is negative i.e. less than 0 (<0).

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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