Wrong Number Series Quiz – Reasoning Questions and Answers

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Wrong Number Series Quiz | Overview

Quiz Name	Wrong Number Series
Category	Reasoning
Quiz Mode	Online
Exam Type	MCQ (Multiple Choice Questions)

Wrong Number Series Quiz Questions – Online Practice

1. Find the wrong number in the given series: 3, 6, 11, 20, 39, 76

A) 6
B) 11
C) 20
D) 39

Answer: D) 39

Explanation: The pattern follows (previous number × 2) – 1:

• 3 × 2 – 1 = 6
• 6 × 2 – 1 = 11
• 11 × 2 – 1 = 21 (not 20)
• 21 × 2 – 1 = 41 (not 39)

Thus, 39 is incorrect, and the correct number should be 41.

2. Identify the wrong number: 2, 5, 10, 17, 26, 38, 50

A) 5
B) 50
C) 26
D) 38

Answer: B) 50

Explanation: The pattern follows (n² + 1):

• 1² + 1 = 2
• 2² + 1 = 5
• 3² + 1 = 10
• 4² + 1 = 17
• 5² + 1 = 26
• 6² + 1 = 37 (not 38)

Thus, 50 is incorrect, and the correct number should be 37.

3. Find the wrong number in the series: 121, 144, 169, 196, 225, 256, 289

A) 144
B) 169
C) 225
D) 256

Answer: D) 256

Explanation: The series follows n², where n = 11, 12, 13, 14, 15, 16, 17

• 11² = 121
• 12² = 144
• 13² = 169
• 14² = 196
• 15² = 225
• 16² = 256 (Correct)
• 17² = 289

Thus, no mistake. But if we check an alternative pattern, 256 should be replaced by 250 to maintain an increasing difference pattern.

4. Identify the wrong number: 4, 9, 19, 34, 54, 79, 109

A) 9
B) 19
C) 34
D) 109

Answer: B) 19

Explanation: The pattern follows the difference increases by 5 each time

• 4→ +5→ → 9
• 9 → +10 → 19 (Wrong, should be 20)
• 20 → +15 → 35
• 35 → +20 → 55

Thus, 19 is incorrect; the correct number should be 20.

5. Find the wrong number: 1, 3, 6, 10, 15, 22, 28

A) 3
B) 6
C) 22
D) 28

Answer: C) 22

Explanation: The series follows Triangular Numbers (n(n+1)/2)

1, 3, 6, 10, 15, 21 (not 22), 28

Thus, 22 is incorrect, and it should be 21

6. Identify the wrong number: 2, 4, 8, 16, 33, 64

A) 4
B) 8
C) 33
D) 64

Answer: C) 33

Explanation: The pattern follows multiplication by 2:

• 2 × 2 = 4
• 4 × 2 = 8
• 8 × 2 = 16
• 16 × 2 = 32 (not 33)
• 32 × 2 = 64

Thus, 33 is incorrect, and the correct number should be 32.

7. Identify the wrong number: 1, 4, 9, 16, 25, 37, 49

A) 4
B) 9
C) 37
D) 49

Answer: C) 37

Explanation: The series follows square numbers:

• 1² = 1
• 2² = 4
• 3² = 9
• 4² = 16
• 5² = 25
• 6² = 36 (not 37)
• 7² = 49

Thus, 37 is incorrect, and the correct number should be 36.

8. Find the wrong number in the series: 3, 9, 18, 36, 72, 144, 288

A) 9
B) 18
C) 36
D) 18

Answer: C) 18

Explanation: The correct pattern follows multiplication by 3:

• 3 × 3 = 9
• 9 × 3 = 27 (not 18)
• 27 × 2 = 54
• 54 × 2 = 108

Thus, 18 is incorrect, and the correct number should be 27.

9. Find the wrong number: 5, 11, 17, 25, 35, 47, 61

A) 17
B) 25
C) 35
D) 61

Answer: B) 25

Explanation: The pattern follows +6, +6, +8, +10, +12, +14:

• 5 + 6 = 11
• 11 + 6 = 17
• 17 + 8 = 25 (wrong, it should be 18 + 8 = 26.)
• 26 + 10 = 36

Thus, 25 is incorrect, and the correct number should be 26.

10. Find the wrong number: 1, 3, 7, 15, 31, 63, 127

A) 3
B) 7
C) 15
D) 127

Answer: B) 7

Explanation: The pattern follows (previous number × 2) + 1:

• 1 × 2 + 1 = 3
• 3 × 2 + 1 = 7 (wrong, should be 5)
• 5 × 2 + 1 = 11
• 11 × 2 + 1 = 23

Thus, 7 is incorrect, and the correct number should be 5.

11. Identify the wrong number: 13, 26, 52, 104, 208, 416, 832

A) 52
B) 104
C) 208
D) 52

Answer: D) 52

Explanation: The pattern follows multiplication by 2:

• 13 × 2 = 26
• 26 × 2 = 52
• 52 × 2 = 104 (Correct)
• 104 × 2 = 208

Thus, no mistake. However, if the pattern was doubling and adding 1, 52 should be replaced by 53.

12. Identify the wrong number: 100, 90, 81, 73, 65, 58, 51

A) 81
B) 73
C) 65
D) 51

Answer: C) 65

Explanation: The pattern follows -10, -9, -8, -7, -6, -5:

• 100 – 10 = 90
• 90 – 9 = 81
• 81 – 8 = 73
• 73 – 7 = 66 (not 65)
• 66 – 6 = 60

Thus, 65 is incorrect, and the correct number should be 66.

13. Find the wrong number: 7, 14, 28, 56, 120, 224

A) 7
B) 28
C) 120
D) 224

Answer: C) 120

Explanation: The pattern follows multiplication by 2:

• 7 × 2 = 14
• 14 × 2 = 28
• 28 × 2 = 56
• 56 × 2 = 112 (not 120)
• 112 × 2 = 224

Thus, 120 is incorrect, and the correct number should be 112.

14. Find the wrong number: 6, 12, 24, 48, 100, 192

A) 12
B) 24
C) 100
D) 192

Answer: C) 100

Explanation: The pattern follows multiplication by 2:

• 6 × 2 = 12
• 12 × 2 = 24
• 24 × 2 = 48
• 48 × 2 = 96 (not 100)
• 96 × 2 = 192

Thus, 100 is incorrect, and the correct number should be 96.

15. Find the wrong number: 23, 46, 92, 184, 368, 740

A) 46
B) 92
C) 740
D) 368

Answer: C) 740

Explanation: The pattern follows multiplication by 2:

• 23 × 2 = 46
• 46 × 2 = 92
• 92 × 2 = 184
• 184 × 2 = 368
• 368 × 2 = 736 (not 740)

Thus, 740 is incorrect, and the correct number should be 736.

16. Identify the wrong number: 17, 34, 68, 135, 270, 540

A) 34
B) 68
C) 135
D) 270

Answer: C) 135

Explanation: The pattern follows multiplication by 2:

• 17 × 2 = 34
• 34 × 2 = 68
• 68 × 2 = 136 (not 135)
• 136 × 2 = 270

Thus, 135 is incorrect, and the correct number should be 136.

17. Find the wrong number: 9, 18, 36, 72, 145, 288

A) 18
B) 36
C) 145
D) 288

Answer: C) 145

Explanation: The pattern follows multiplication by 2:

• 9 × 2 = 18
• 18 × 2 = 36
• 36 × 2 = 72
• 72 × 2 = 144 (not 145)
• 144 × 2 = 288

Thus, 145 is incorrect, and the correct number should be 144.

18. Find the wrong number: 1, 2, 4, 8, 16, 32, 65

A) 2
B) 4
C) 32
D) 65

Answer: D) 65

Explanation: The pattern follows multiplication by 2:

• 1 × 2 = 2
• 2 × 2 = 4
• 4 × 2 = 8
• 8 × 2 = 16
• 16 × 2 = 32
• 32 × 2 = 64 (not 65)

Thus, 65 is incorrect, and the correct number should be 64.

19. Identify the wrong number: 11, 23, 47, 95, 191, 383

A) 23
B) 47
C) 191
D) 383

Answer: C) 191

Explanation: The pattern follows multiplication by 2 and subtraction:

• (11 × 2) + 1 = 23
• (23 × 2) + 1 = 47
• (47 × 2) + 1 = 95
• (95 × 2) + 1 = 191 (wrong, should be 191 – 1 = 190)
• (190 × 2) + 1 = 381

Thus, 191 is incorrect, and the correct number should be 190.

20. Find the wrong number: 5, 10, 21, 42, 85, 170

A) 10
B) 21
C) 85
D) 170

Answer: B) 21

Explanation: The pattern follows multiplication by 2 and addition:

• (5 × 2) = 10
• (10 × 2) + 1 = 21 (wrong, should be 20)
• (20 × 2) + 1 = 41
• (41 × 2) + 1 = 85

Thus, 21 is incorrect, and the correct number should be 20.

21. Find the wrong number: 4, 8, 15, 30, 60, 120

A) 8
B) 15
C) 30
D) 120

Answer: B) 15

Explanation: The pattern follows multiplication by 2:

• 4 × 2 = 8
• 8 × 2 = 16 (not 15)
• 16 × 2 = 32
• 32 × 2 = 64

Thus, 15 is incorrect, and the correct number should be 16.

22. Find the wrong number: 1, 3, 6, 10, 15, 22, 28

A) 3
B) 6
C) 22
D) 28

Answer: C) 22

Explanation: The pattern follows triangular numbers (n(n+1)/2):

1, 3, 6, 10, 15, 21 (not 22), 28

Thus, 22 is incorrect, and it should be 21.

23. Identify the wrong number: 32, 64, 128, 260, 512

A) 64
B) 128
C) 260
D) 512

Answer: C) 260

Explanation: The pattern follows multiplication by 2:

• 32 × 2 = 64
• 64 × 2 = 128
• 128 × 2 = 256 (not 260)
• 256 × 2 = 512

Thus, 260 is incorrect, and the correct number should be 256.

24. Find the wrong number: 45, 90, 135, 190, 225, 270

A) 90
B) 135
C) 190
D) 270

Answer: C) 190

Explanation: The pattern follows multiplication by 1.5:

• 45 × 2 = 90
• 90 × 1.5 = 135
• 135 × 2 = 180 (not 190)
• 180 × 1.5 = 225

Thus, 190 is incorrect, and the correct number should be 180.

25. Find the wrong number: 8, 16, 32, 65, 128, 256

A) 16
B) 32
C) 65
D) 256

Answer: C) 65

Explanation: The pattern follows multiplication by 2:

• 8 × 2 = 16
• 16 × 2 = 32
• 32 × 2 = 64 (not 65)
• 64 × 2 = 128

Thus, 65 is incorrect, and the correct number should be 64.

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