Odd Man Out Series

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Directions: Each of the questions given below is followed by series of options among which you have to choose the best one. You can also review your choices by clicking into answer section.

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

A. 64

B. 196

C. 216

D. 1

Ans: Option B

Explanation:

The pattern is 13, 23, 33, 43, 53, 63, 73.

196 is not a perfect cube

2. 10, 25, 45, 54, 60, 75, 80

A.10

B.45

C.54

D.75

Ans: Option C

Explanation:

Each of the numbers except 54 is multiple of 5.

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

A. -5

B. -145

C. -255

D. -195

Ans: Option B

Explanation:

30

30 – 35 = -5

-5 – 40 = -45

-45 – 45 = -90

-90 – 50 = -140

-140 – 55 = -195

-195 – 60 = -255

Hence, -145 is wrong. -140 should have come in place of -145

4.  2, 5, 10, 17, 26, 37, 50, 64

A.50

B.26

C.37

D.64

Ans: Option D

Explanation:

(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.

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

A. 95

B. 45

C. 32

D. 21

Ans: Option A

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.

6. 835, 734, 642, 751, 853, 981, 532

A.751

B.853

C.981

D.532

Ans: Option A

Explanation:

In each number except 751, the difference of third and first digit is the middle one.

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

A. 277

B. 271

C. 263

D. 241

Ans: Option B

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

8. 1, 4, 9, 16, 20, 36, 49

A.1

B.9

C.20

D.49

Ans: Option C

Explanation:

The pattern is 12, 22, 32, 42, 52, 62, 72. But, instead of 52, it is 20 which to be turned out.

9. Insert the missing number: 2, 6, 12, 20, 30, 42, 56, (…..)

A 60

B. 64

C. 72

D. 70

Ans: Option C

Explanation:

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.

10. Find the wrong number 52, 51, 48, 43, 34, 27, 16

A.27

B.34

C.43

D.48

Ans: Option B

Explanation:

Subtract 1, 3, 5, 7, 9, 11 from successive numbers.

So, 34 is wrong.

11. Find the odd man out:

A 671

B. 462

C. 427

D. 264

Ans: Option C

Explanation:

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

12. Find the wrong number  46080, 3840, 384, 48, 24, 2, 1

A.1

B.2

C.24

D.384

Ans: Option C

Explanation:

The terms are successively divided by 12, 10, 8, 6, …etc.

So, 24 is wrong, it should be 8 (48/6 = 8).

13. Find the wrong number  36, 54, 18, 27, 9, 18.5, 4.5

A.4.5

B.18.5

C.54

D.18

Ans: Option B

Explanation:

The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.

14. Insert the missing number 2, 4, 12, 48, 240, (….)

A.960

B.1440

C.1080

D.1920

Ans: Option B

Explanation:

Go on multiplying the given numbers by 2, 3, 4, 5, 6.

So, the correct next number is 1440.

15. Insert the missing number 11, 13, 17, 19, 23, 29, 31, 37, 41, (….)

A.43

B.47

C.53

D.51