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 – IPart – IIPart– IIIPart – IVPart – V
Part – VIPart – VIIPart – VIIIPart – IXPart – X

Odd Man out: Part – I | Part II.

Questions Section

S. No.SeriesAnswer / 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.
38, 64, 27, 60, 216, 512Every other number is a perfect cube except 60, it lies between cube of 2 and 4 i.e. 8 and 64 respectively.
42, 6, 14, 17, 22, 38Every other number is even except 17, it is not divisible by 2 and hence it is an odd number.
52, 5, 10, 15, 26, 37The 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.
699, 117, 65, 198, 207Every number is divisible by 9 except 65.
714, 23, 25, 32, 41, 501 + 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, 23The 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.
939, 91, 143, 169, 188All 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.
103, 7, 12, 13, 21Answer 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.
1127, 81, 144, 155, 162All 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.
12242, 122, 133, 331, 442, 263Except 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.
13264, 165, 297, 441, 594Except 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.
14279, 369, 268, 235, 484Except 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.
15105, 235, 335, 441, 695Except 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, 621Except 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.
1742, 62, 88, 144, 211, 338Except 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.
1821, 120, 147, 201, 332Except 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.
194, 21, 13, -8, 44Except -8 every other number is positive i.e. >0.
20-2, -111, 102, -91, -101Except 102 every other number is negative i.e. less than 0 (<0).

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Conclusion

Hope this article is of help to you all. Please let us know in comments if we need to improve anything or if you want us to help in any other topic.

FAQs

Q1. How to improve skills to solve aptitude questions quickly?

Just keep on doing the practice that is very important. Solve old question papers, solve mock tests, practice questions etc.

Q2. Are aptitude questions asked in all competitive exams?

Yes it is asked in almost all competitive exams.

Q3. Find the odd one out 3, 5, 11, 14.

Ans. 14 – every number is odd except 14.

Q4. Find the odd one out 3,5,11,14,17,21.

Ans. 14 – every number is odd except 14.

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