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Question 1: Instructions: In the following number series only one number is wrong. Find out the wrong number.
7, 12, 40, 222, 1742, 17390, 208608

a) 7

b) 12

c) 40

d) 1742

e) 208608

Question 2: Instructions: In the following number series only one number is wrong. Find out the wrong number.
6, 91, 584, 2935, 11756, 35277, 70558

a) 91

b) 70558

c) 584

d) 2935

e) 35277

Question 3: Instructions: In the following number series only one number is wrong. Find out the wrong number.
9050, 5675, 3478, 2147, 1418, 1077, 950

a) 3478

b) 1418

c) 5673

d) 2147

e) 1077

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Question 4: Instructions: In the following number series only one number is wrong. Find out the wrong number.
1, 4, 25, 256, 3125, 46656, 823543

a) 3125

b) 823543

c) 46656

d) 25

e) 256

Question 5: Instructions: In the following number series only one number is wrong. Find out the wrong number.
8424, 4212, 2106, 1051, 526.5, 263.25, 131.625

a) 131.625

b) 1051

c) 4212

d) 8424

e) 263.25

InstructionsInstructions: In each of these questions a number series is given. In each series only one number is wrong. Find out the wrong number.

Question 6: 5531    5506    5425    5304    5135    4910    4621

a) 5531

b) 5425

c) 4621

d) 5135

e) 5506

Question 7: 6 7 9 13 26 37 68

a) 7

b) 26

c) 69

d) 37

e) 9

Question 8: 1    3    10    36    152    760    4632

a) 3

b) 36

c) 4632

d) 760

e) 152

Question 9: 4    3    9    34    96    219    435

a) 4

b) 9

c) 34

d) 435

e) 219

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Question 10: 157.5 45 15 6 3 2 1

a) 1

b) 2

c) 6

d) 157.5

e) 45

Instructions

Find the wrong number in given series sequence.

Question 11: 1, 4, 15, 64 325, 1955

a) 15

b) 64

c) 325

d) 1955

e) None of these

Question 12: 6, 12, 21, 33, 49, 66

a) 21

b) 33

c) 49

d) 66

e) None of these

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Question 13: 6, 11.5, 19, 28.5, 41

a) 6

b) 11.5

c) 41

d) 28.5

e) None of these

Question 14: 5, 26, 82, 214, 401, 702

a) 26

b) 82

c) 214

d) 401

e) None of these

Question 15: 5,20,73,274,1049

a) 20

b) 73

c) 274

d) 1049

e) None of these

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Answers & Solutions:

1) Answer (D)

(7-1) x 2 = 12
(12 – 2) x 4 = 40
(40 – 3) x 6 = 222
(222 – 4) x 8 = 1744 ≠ 1742
(1744 – 5) x 10 = 17390
(17390 – 6) x 12 = 208608

2) Answer (C)

6 x 7 + 7² = 91 , 91 x 6 + 6² = 582 ≠ 584 , 582 x 5 + 5² = 2935,…

3) Answer (E)

9070 – 15³ = 5675 , 5675 – 13³ = 3478 , 3478 – 11³ = 2147 , 2147 – 9³ = 1418 , 1418 – 7³ = 1075 ≠ 1077 , 1075 – 5³ = 950

4) Answer (D)

1¹ = 1 , 2² = 4 , 3³ = 27 ≠ 25 , 4⁴ = 256 , 5⁵ = 3125 , 6⁶ = 46656 , 7⁷ = 823543

5) Answer (B)

$\frac{8424}{2}$ = 4212

$\frac{4212}{2}$ = 2106

$\frac{2106}{2}$ = 1053 ≠ 1051

$\frac{1051}{2}$ = 526.5

$\frac{525.5}{2}$ = 263.25

$\frac{263.25}{2}$ = 131.625

6) Answer (A)

5531 – 5² = 5506
5506 – 9² = 5425
5425 – 11² = 5304
5134 – 13² = 5135
5135 – 15² = 4910
4910 – 17² = 4621

Ever number after 5531 has a difference of a square.
Hence 5531 is the wrong number.

7) Answer (B)

This should be the series.

6 + 1 = 7
7 + 2 = 9
9 + 4 = 13
13 + 8= 21
21 + 16 = 37
37 + 32 = 69
Hence, we can say that 26 is incorrect.

8) Answer (D)

(1 x 1) + 2 = 3
(3 x 2) + 4 = 10
(10 x 3) + 6 = 36
(36 x 4) + 8 = 152
(152 x 5) + 10 = 770 ≠760
(770 x 6) + 12 = 4632

9) Answer (D)

0² + 4 = 4
1² + 2 = 3
3² + 0 = 9
6² – 2 = 34
10² – 4 = 96
15² – 6 = 219
21² – 8 = 433 ≠ 435

10) Answer (A)

157.5 ÷ 3.5 = 45
45 ÷ 3 = 15
15 ÷ 2.5 = 6
6 ÷ 2 = 3
3 ÷ 1.5 = 2
2 ÷ 1 = 2 ≠ 1

11) Answer (D)

4 = 1*2+2 ; 15 = 4*3+3 ; 64 = 15*4+4 ; 325 = 64*5+5 ; 1956 = 325*6+6

The nth term is of the form,

$T_n=(T_{n-1}\times n)+n$

The last term does not follow the pattern and is thus the wrong number in the sequence.

12) Answer (C)

2*2+2 = 6 ; 3*3+3 = 12 ; 4*4 + 5= 21 ; 5*5 +8 = 33 ; 6*6 + 12 = 48

13) Answer (C)

1.5*2 + 3 = 6

2.5*3 + 4 = 11.5

3.5*4 + 5 = 19

4.5*5 + 6 = 28.5

5.5*6 + 7 = 40

14) Answer (C)

1*2+3=5 ; 4*5+6 = 26 ; 8*9+10 = 82 ; 13*14+15 = 212 ; 19*20 + 21 =401 ; 26*27 +28 = 702

15) Answer (C)

1^2 + 4= 5 ; 2^2 + 16 = 20 ; 3^2 + 64 = 73 ; 4^2 + 256 = 272 ; 5^2 + 1024 = 1049

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