Odd Man Out and Series problems test one’s ability to discern patterns and sequences in numbers, letters, or symbols. These problems require identifying the underlying rule in a series or finding which element does not fit a certain pattern. They are common in various competitive exams and are key in assessing logical reasoning and analytical skills.
1. Find the odd one out: 3, 5, 11, 14, 17, 19
a) 3
b) 11
c) 14
d) 17
Answer:
c) 14
Explanation:
All except 14 are prime numbers.
2. Choose the number that does not belong: 64, 125, 216, 312, 729
a) 125
b) 216
c) 312
d) 729
Answer:
c) 312
Explanation:
All except 312 are perfect cubes (4^3, 5^3, 6^3, 9^3). 312 is not a perfect cube.
3. Find the odd one out: 2, 6, 12, 20, 30, 42, 56
a) 12
b) 20
c) 30
d) 42
Answer:
c) 30
Explanation:
All others are products of two consecutive numbers (2×1, 3×2, 4×3, 6×5, 7×6). 30 is not.
4. Select the odd one: ACD, EGJ, IKN, MPR, SVY
a) ACD
b) EGJ
c) MPR
d) SVY
Answer:
c) MPR
Explanation:
In all others, the second and third letters are consecutive in the alphabet.
5. Identify the odd series: 1, 4, 9, 16, 25, 36; 2, 3, 5, 8, 12, 17; 3, 5, 8, 12, 17, 23; 4, 7, 11, 16, 22, 29
a) 1, 4, 9, 16, 25, 36
b) 2, 3, 5, 8, 12, 17
c) 3, 5, 8, 12, 17, 23
d) 4, 7, 11, 16, 22, 29
Answer:
a) 1, 4, 9, 16, 25, 36
Explanation:
All in option a) are perfect squares. The others are not.
6. Choose the odd one out: 41, 43, 47, 53, 61
a) 41
b) 43
c) 53
d) 61
Answer:
d) 61
Explanation:
All except 61 are prime numbers less than 50.
7. Identify the odd series: ABC, DEF, GHI, JKL, MNO, QRS
a) ABC
b) DEF
c) JKL
d) QRS
Answer:
d) QRS
Explanation:
All others are sequences of three consecutive alphabets. QRS skips P.
8. Find the odd one out: 121, 144, 169, 196, 225, 256, 289
a) 144
b) 169
c) 196
d) 256
Answer:
d) 256
Explanation:
All except 256 are odd perfect squares. 256 is an even perfect square (16^2).
9. Choose the odd one: 8, 27, 64, 100, 125
a) 27
b) 64
c) 100
d) 125
Answer:
c) 100
Explanation:
All except 100 are perfect cubes.
10. Identify the odd series: 6-18, 10-30, 14-42, 18-54, 22-66
a) 6-18
b) 10-30
c) 14-42
d) 22-66
Answer:
d) 22-66
Explanation:
In all others, the second number is three times the first. In 22-66, it is not.
11. Find the odd one out: 7, 14, 28, 35, 49
a) 7
b) 14
c) 28
d) 35
Answer:
d) 35
Explanation:
All except 35 are multiples of 7 and less than 30.
12. Select the odd one: 3, 8, 15, 24, 35, 48
a) 8
b) 15
c) 24
d) 35
Answer:
d) 35
Explanation:
All others are one less than a perfect square.
13. Identify the odd series: 579, 264, 863, 642, 461
a) 579
b) 264
c) 863
d) 642
Answer:
c) 863
Explanation:
In all others, the middle digit is the sum of the other two.
14. Choose the odd one out: 1/3, 2/5, 3/7, 4/9, 5/11
a) 1/3
b) 2/5
c) 3/7
d) 4/9
Answer:
d) 4/9
Explanation:
All others are fractions where the denominator is two more than the numerator.
15. Find the odd one out: 0, 5, 10, 15, 20, 25, 30
a) 0
b) 10
c) 20
d) 25
Answer:
d) 25
Explanation:
All except 25 are multiples of 5 and less than or equal to 30.
16. Select the odd one: AEG, BFI, CHK, DJL, EKN
a) AEG
b) BFI
c) CHK
d) EKN
Answer:
d) EKN
Explanation:
In all others, the second and third letters are consecutive in the alphabet.
17. Identify the odd series: 1-3, 4-12, 6-18, 8-24, 10-30
a) 1-3
b) 4-12
c) 6-18
d) 10-30
Answer:
b) 4-12
Explanation:
In all others, the second number is three times the first. In 4-12, it is not.
18. Choose the odd one out: 31, 37, 41, 43, 53
a) 31
b) 37
c) 41
d) 53
Answer:
a) 31
Explanation:
All except 31 are prime numbers greater than 30.
19. Find the odd one out: 6, 12, 18, 24, 30, 36, 45
a) 12
b) 18
c) 30
d) 45
Answer:
d) 45
Explanation:
All others are multiples of 6.
20. Select the odd one: 121, 131, 141, 151, 161
a) 121
b) 131
c) 141
d) 161
Answer:
c) 141
Explanation:
All others are prime numbers.
21. Identify the odd series: 1357, 2468, 3579, 4680, 5791
a) 1357
b) 2468
c) 3579
d) 4680
Answer:
d) 4680
Explanation:
In all others, each digit is one more than the previous digit.
22. Choose the odd one out: 16, 25, 36, 49, 64
a) 16
b) 25
c) 36
d) 49
Answer:
a) 16
Explanation:
All except 16 are odd perfect squares.
23. Find the odd one out: 2-10, 3-15, 4-20, 5-25, 6-30
a) 2-10
b) 3-15
c) 4-20
d) 5-25
Answer:
d) 5-25
Explanation:
In all others, the second number is five times the first.
24. Select the odd one: CAT, BAT, RAT, MAT, PAT
a) CAT
b) BAT
c) RAT
d) MAT
Answer:
d) MAT
Explanation:
All others have animals' names.
25. Select the odd one: CAT, BAT, RAT, MAT, PAT
a) CAT
b) BAT
c) RAT
d) MAT
Answer:
d) MAT
Explanation:
All others represent names of animals, whereas MAT does not.
26. Identify the odd series: 1-4-9, 2-8-18, 3-12-27, 4-16-36, 5-20-45
a) 1-4-9
b) 2-8-18
c) 4-16-36
d) 5-20-45
Answer:
b) 2-8-18
Explanation:
In all series except 2-8-18, the third number is the square of the first number (1^2 = 1, 3^2 = 9, 4^2 = 16, 5^2 = 25). In 2-8-18, 18 is not the square of 2.