Odd Man Out Series Multiple Choice Questions

1. Insert the missing number :
2, 6, 12, 20, 30, 42, 56, (…..)
A. 60
B. 64
C. 72
D. 70

The pattern is 1 × 2, 2 × 3, 3 × 4, 4 × 5, 5 × 6, 6 × 7, 7 × 8.
So, the next numbers is 8 × 9 = 72.

2. Find the odd man out :
16, 25, 36, 72, 144, 196, 225
A. 36
B. 72
C. 196
D. 225

Each of the numbers except 72, is a perfect square.

3. Find the odd man out :
2, 5, 10, 50, 500, 5000
A. 0
B. 5
C. 10
D. 5000

Pattern is 1st × 2nd = 3rd;
2nd × 3rd = 4th;
3rd × 4th = 5th;
But, 4th × 5th = 50 × 500 = 25000 ‡ 5000 = 6th.

4. Find out the wrong number in the series :
19, 26, 33, 46, 59, 74, 91
A. 26
B. 33
C. 46
D. 59

Go on adding 7, 9, 11, 13, 15, 17 respectively to obtain the next number. So, 33 is wrong.

5. Find the odd man out :
253, 136, 352, 460, 324, 631, 244
A. 136
B. 324
C. 352
D. 631

Sum of the digits in each number, except 324 is 10.

6. Find the odd man out. 1, 3, 9, 12, 19, 29
A. 12
B. 9
C. 1
D. 3

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

7. Find the odd man out. 1, 8, 27, 64, 125, 196, 216, 343
A. 64
B. 196
C. 216
D. 1

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

8. Find the odd man out. 15, 25, 30, 51, 85, 90, 115
A. 15
B. 25
C. 51
D. 90

All except 51 are multiples of 5

9. Find the odd man out. 24,36,52,72,96
A. 72
B. 52
C. 36
D. 24

All except 52 are multiples of 6

10. Find the odd man out. 187, 264, 386, 473, 682, 781
A. 386
B. 187
C. 781
D. 682

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

11. Insert the missing number. 8, 7, 11, 12, 14, 17, 17, 22, (….)
A. 20
B. 22
C. 24
D. 27

There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22) increasing by 3 and 5 respectively.

12. Find out the wrong number in the given sequence of numbers.
582, 605, 588, 611, 634, 617, 600
A. 634
B. 611
C. 605
D. 600

Alternatively, 23 is added and 17 is subtracted from the terms. So, 634 is wrong.

13. Find the odd man out? 396, 462, 572, 427, 671, 264.
A. 671
B. 462
C. 427
D. 264

In each number except 427, the middle digit is the sum of other two.

14. Find the odd man out.
2, 5, 10, 17, 26, 37, 50, 64
A. 50
B. 37
C. 26
D. 64

(1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1
But, 64 is out of pattern.

15. Insert the missing number.
2, 4, 12, 48, 240, (….)
A. 960
B. 1440
C. 1080
D. 1920

Go on multiplying the given numbers by 2, 3, 4, 5, 6.
So, the correct next number is 1440.

16. Find the one which does not belong to that group?
A. 3
B. 4
C. 5
D. 9
E. 7

3, 5, 9 and 7 are odd numbers, but not 4.

17. Find the one which does not belong to that group?
A. 27
B. 37
C. 47
D. 67

37, 47, 67 and 17 are prime numbers but not 27.

18. Find the one which does not belong to that group?
A. 16
B. 28
C. 36
D. 64

16, 36, 64 and 4 are perfect squares but not 28.

19. Find the one which does not belong to that group?
A. 41
B. 43
C. 53
D. 47
E. 57

41, 43, 47 and 53 are prime numbers, but not 57.

20. Find the one which does not belong to that group?
A. 36
B. 49
C. 64
D. 81

36, 64, 81 and 100 are squares of composite numbers, but not 49.

21. 3, 5, 11, 14, 17, 21
A. 21
B. 17
C. 14
D. 3

Each of the numbers except 14 is an odd number.
The number ’14’ is the only EVEN number.

22. 8, 27, 64, 100, 125, 216, 343
A. 27
B. 100
C. 125
D. 343

The pattern is 2^3, 3^3, 4^3, 5^3, 6^3, 7^3. But, 100 is not a perfect cube.

23. 10, 25, 45, 54, 60, 75, 80
A. 10
B. 45
C. 54
D. 75

Each of the numbers except 54 is multiple of 5.

24. 396, 462, 572, 427, 671, 264
A. 396
B. 427
C. 671
D. 264

In each number except 427, the middle digit is the sum of other two.

25. 6, 9, 15, 21, 24, 28, 30
A. 28
B. 21
C. 24
D. 30

Each of the numbers except 28, is a multiple of 3.