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# Maths : Odd Man Out (Solved in Steps)

1. Find the odd man out. 1, 3, 9, 12, 19, 29

A. 12 B. 9 C. 1 D. 3

Explanation :

12 is an even number. All other given
numbers are odd

2. Find the odd man out. 24,36,52,72,96

A. 72 B. 52 C. 36 D. 24

Explanation :

All except 52 are multiples of 6

3. Find the odd man out. 1, 8, 27, 64, 125, 196, 216, 343

A. 64 B. 196 C. 216 D. 1

Explanation :

The pattern is 1³, 2³, 3³, 4³, 5³, 6³, 7³
196 is not a perfect cube

4. Find the odd man out. 15, 25, 30, 51, 85, 90, 115

A. 15 B. 25 C. 51 D. 90

Explanation :

All except 51 are multiples of 5

5. Find the odd man out. 187, 264, 386, 473, 682, 781

A. 386 B. 187 C. 781 D. 682

Explanation :

In all numbers except 386, the middle digit is the sum of other two digits.

6. Find the odd man out. 12, 24, 34, 48, 64, 84

A. 48 B. 34 C. 24 D. 12

Explanation :

All numbers except 34 are multiples of 4

7. Find the odd man out. 362, 482, 551, 263, 344, 284

A. 362 B. 482 C. 551 D. 344

Explanation :

In all numbers except 344, the product of first and third digits is the middle digit.

8. Find the odd man out. 742, 743, 633, 853, 871, 990, 532

A. 532 B. 990 C. 633 D. 742

Explanation :

In all numbers except 742, the difference between third and first digit is the middle digit.

9. Find the odd man out. 6, 13, 18, 25, 30, 37, 40

A. 40 B. 30 C. 37 D. 25

Explanation :

The difference between two successive terms from the beginning are 7, 5, 7, 5, 7, 5
Hence, in place of 40, the right number is 37+5=42

10. Find the odd man out. 445, 221, 109, 46, 25, 11, 4

A. 25 B. 109 C. 46 D. 221

Explanation :

To obtain next number, subtract 3 from the previous number and divide the result by 2
445
(445-3)/2 = 221
(221-3)/2 = 109
(109-3)/2 = 53
(53-3)/2 = 25
(25-3)/2 = 11
(11-3)/2 = 4
Clearly, 53 should have come in place of 46

11. Find the odd man out. 1, 5, 11, 17, 23, 29

A. 29 B. 17 C. 11 D. 1

Explanation :

All given numbers except 1 are prime numbers.
One is not a prime number because it does not have two factors. It is divisible by only1

12. Find the odd man out. 2, 3, 5, 9, 12, 17, 23

A. 12 B. 9 C. 23 D. 2

Explanation :

2
2 + 1 = 3
3 + 2 = 5
5 + 3 = 8
8 + 4 = 12
12 + 5 = 17
17 + 6 = 23
ie, 8 should have come in place of 9

13. Find the odd man out. 7,13,19,25,29,37,43

A. 19 B. 29 C. 25 D. 43

Explanation :

All given numbers except 25 are prime numbers.

14. Find the odd man out. 1, 9, 16, 51, 121, 169, 225

A. 169 B. 51 C. 16 D. 1

Explanation :

Each of the given numbers except 51 is a perfect square

15. Find the odd man out. 1, 4, 9, 17, 25, 36, 49

A. 1 B. 9 C. 17 D. 49

Explanation :

The patter is 1², 2², 3², 4², 5², 6², 7²
But, instead of 4², 17 is given

16. Find the odd man out. 2, 5, 10, 17, 26, 38, 50, 65

A. 50 B. 38 C. 26 D. 65

Explanation :

The pattern is (1×1)+1 , (2×2)+1 , (3×3)+1 ,
(4×4)+1 , (5×5)+1 , (6×6)+1 , (7×7)+1 , (8×8)+1
Hence, in place of 38, the right number was (6×6)+1 = 37

17. Find the odd man out. 18, 16, 12, 24, 11, 34, 46

A. 16 B. 46 C. 16 D. 11

Explanation :

11 is the only odd number in the given series

18. Find the odd man out. 1, 27, 216, 512, 1024, 1331

A. 1024 B. 512 C. 27 D. 1

Explanation :

All given numbers except 1024 are perfect cubes

19. Find the odd man out. 1, 16, 81, 255, 625, 1296

A. 255 B. 1296 C. 81 D. 1

Explanation :

The patter is 1⁴, 2⁴, 3⁴, 5⁴, 6⁴
Hence, in place of 255, the right digit is 4⁴ = 256

20. Find the odd man out. 1050, 510, 242, 106, 46, 16, 3

A. 46 B. 106 C. 510 D. 1050

Explanation :

1050
(1050 – 30)/2 = 510
(510 – 26)/2 = 242
(242 – 22)/2 = 110
(110 – 18)/2 = 46
(46- 14)/2 = 16
(16- 10)/2 = 3
Hence, 110 should have come in place of 106

21. Find the odd man out. 3, 8, 18, 38, 78, 158, 316

A. 38 B. 158 C. 316 D. 8

Explanation :

3
3 × 2 + 2 = 8
8 × 2 + 2 = 18
18 × 2 + 2 = 38
38 × 2 + 2 = 78
78 × 2 + 2 = 158
158 × 2 + 2 = 318
Hence, 316 is wrong and 318 should have come in place of that

22. Find the odd man out. 5, 6, 14, 45, 185, 925, 5556

A. 5556 B. 925 C. 185 D. 6

Explanation :

5 × 1 + 1 = 6
6 × 2 + 2 = 14
14 × 3 + 3 = 45
45 × 4 + 4 = 184
184 × 5 + 5 = 925
925 × 6 + 6 = 5556
Hence, it is clear that 184 should have come instead of 185

23. Find the odd man out. 23, 27, 36, 52, 77, 111, 162

A. 162 B. 111 C. 52 D. 27

Explanation :

23+2²=27
27+3²=36
36+4²=52
52+5²=77
77+7²=162
Hence, 113 should have come in place of 111

24. Find the odd man out. 241, 263, 248, 271, 255, 277, 262

A. 277 B. 271 C. 263 D. 241

Explanation :

Alternatively, 22 is added and 15 is subtracted from the terms. Hence, 271 is wrong
241
241 + 22 = 263
263 – 15 = 248
248 + 22 = 270
270 – 15 = 255
255 + 22 = 277
277 – 15 = 262

25. Find the odd man out. 125, 127, 130, 135, 142, 153, 165

A. 165 B. 142 C. 153 D. 130

Explanation :

Prime numbers 2, 3, 5, 7, 11, 13 are added successively. Hence, 165 is wrong

26. Find the odd man out. 5, 10, 40, 81, 320, 640, 2560

A. 40 B. 81 C. 320 D. 2560

Explanation :

Alternatively 2 and 4 are multiplied with the previous terms
5
5 × 2 = 10
10 × 4 = 40
40 × 2 = 80
80 × 4 = 320
320 × 2 = 640
640 × 4 = 2560
Hence, 81 is wrong. 80 should have come in place of 81.

27. Find the odd man out. 12, 21, 32, 45, 60, 77, 95

A. 95 B. 45 C. 32 D. 21

Explanation :

12 + 9 = 21
21 + 11 = 32
32 + 13 = 45
45 + 15 = 60
60 + 17 = 77
77 + 19 = 96
Hence, 95 is wrong. 96 should have come in place of 95

28. Find the odd man out. 3, 5, 15, 75, 1120, 84375

A. 84375 B. 1120 C. 15 D. 3

Explanation :

Pattern : 1st * 2nd = 3rd, 2nd * 3rd = 4th, etc.
3
5
3 × 5 = 15
5 × 15 = 75
15 × 75 = 1125
75 × 1125 = 84375
Hence, 1120 is wrong. 1125 should have come in place of 1120

29. Find the odd man out. 3576, 1784, 888, 440, 216, 105, 48

A. 105 B. 216 C. 888 D. 1784

Explanation :

3576
(3576-8)/2 = 1784
(1784-8)/2 = 888
(888-8)/2 = 440
(440-8)/2 = 216
(216-8)/2 = 104
(104-8)/2 = 48
Hence, 105 is wrong. 104 should have come in place of 105

30. Find the odd man out. 30, -5, -45, -90, -145, -195, -255

A. -5 B. -145 C. -255 D. -195