Number Series MCQs with Answers for JKSSB, SSC, Railway & Banking Exams

Question #121

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What will come in place of the question mark (?) in the following number series? 10, 30, 90, 270, ?

A. 810

B. 720

C. 540

D. 960

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Correct Answer: Option A

Explanation:
Each term is multiplied by 3. Therefore, 270×3=810.

This question belongs to: Reasoning Number Series

Question #122

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What will come in place of the question mark (?) in the following number series? 1, 2, 5, 14, ?

A. 44

B. 43

C. 41

D. 42

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 3 and subtracting 1. (1×3)-1=2, (2×3)-1=5, (5×3)-1=14. The next term is (14×3)-1=41.

This question belongs to: Reasoning Number Series

Question #123

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What will come in place of the question mark (?) in the following number series? 4, 9, 19, 39, ?

A. 79

B. 77

C. 83

D. 81

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (4×2)+1=9, (9×2)+1=19, (19×2)+1=39. The next term is (39×2)+1=79.

This question belongs to: Reasoning Number Series

Question #124

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What will come in place of the question mark (?) in the following number series? 6, 14, 30, 62, ?

A. 122

B. 126

C. 128

D. 124

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and adding 2. (6×2)+2=14, (14×2)+2=30, (30×2)+2=62. The next term is (62×2)+2=126.

This question belongs to: Reasoning Number Series

Question #125

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What will come in place of the question mark (?) in the following number series? 8, 16, 24, 32, ?

A. 38

B. 40

C. 42

D. 36

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Correct Answer: Option B

Explanation:
The series increases by 8 each time. Therefore, 32+8=40.

This question belongs to: Reasoning Number Series

Question #126

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What will come in place of the question mark (?) in the following number series? 2, 5, 12, 27, ?

A. 54

B. 60

C. 58

D. 56

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and adding 1, then 2, then 3? Let's check: (2×2)+1=5, (5×2)+2=12, (12×2)+3=27. The next term is (27×2)+4=58.

This question belongs to: Reasoning Number Series

Question #127

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What will come in place of the question mark (?) in the following number series? 11, 20, 33, 50, ?

A. 71

B. 73

C. 67

D. 69

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Correct Answer: Option A

Explanation:
The differences are: 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 50+21=71.

This question belongs to: Reasoning Number Series

Question #128

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What will come in place of the question mark (?) in the following number series? 4, 10, 20, 34, ?

A. 54

B. 50

C. 48

D. 52

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Correct Answer: Option D

Explanation:
The differences are: 6, 10, 14. These are increasing by 4. The next difference is 18. Therefore, 34+18=52.

This question belongs to: Reasoning Number Series

Question #129

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What will come in place of the question mark (?) in the following number series? 7, 13, 25, 49, ?

A. 97

B. 103

C. 99

D. 101

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (7×2)-1=13, (13×2)-1=25, (25×2)-1=49. The next term is (49×2)-1=97.

This question belongs to: Reasoning Number Series

Question #130

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What will come in place of the question mark (?) in the following number series? 3, 8, 15, 24, 35, ?

A. 50

B. 52

C. 46

D. 48

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Correct Answer: Option D

Explanation:
The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 35+13=48.

This question belongs to: Reasoning Number Series

Question #131

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What will come in place of the question mark (?) in the following number series? 10, 17, 26, 37, 50, ?

A. 61

B. 67

C. 65

D. 63

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Correct Answer: Option C

Explanation:
The differences are: 7, 9, 11, 13. These are consecutive odd numbers. The next difference is 15. Therefore, 50+15=65.

This question belongs to: Reasoning Number Series

Question #132

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What will come in place of the question mark (?) in the following number series? 3, 12, 48, 192, ?

A. 768

B. 384

C. 576

D. 960

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Correct Answer: Option A

Explanation:
Each term is multiplied by 4. Therefore, 192×4=768.

This question belongs to: Reasoning Number Series

Question #133

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What will come in place of the question mark (?) in the following number series? 5, 11, 21, 35, ?

A. 49

B. 53

C. 51

D. 47

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Correct Answer: Option B

Explanation:
The differences are: 6, 10, 14. These are increasing by 4. The next difference is 18. Therefore, 35+18=53.

This question belongs to: Reasoning Number Series

Question #134

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What will come in place of the question mark (?) in the following number series? 8, 13, 21, 34, ?

A. 55

B. 47

C. 45

D. 49

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Correct Answer: Option A

Explanation:
This is a Fibonacci-like series where each term is the sum of the previous two terms. 8+13=21, 13+21=34, 21+34=55.

This question belongs to: Reasoning Number Series

Question #135

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What will come in place of the question mark (?) in the following number series? 2, 4, 8, 16, 32, ?

A. 56

B. 64

C. 72

D. 48

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Correct Answer: Option B

Explanation:
Each term is multiplied by 2. Therefore, 32×2=64.

This question belongs to: Reasoning Number Series

Question #136

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What will come in place of the question mark (?) in the following number series? 6, 11, 18, 27, 38, ?

A. 49

B. 53

C. 47

D. 51

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Correct Answer: Option D

Explanation:
The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 38+13=51.

This question belongs to: Reasoning Number Series

Question #137

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What will come in place of the question mark (?) in the following number series? 4, 13, 28, 49, ?

A. 74

B. 72

C. 78

D. 76

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Correct Answer: Option D

Explanation:
The differences are: 9, 15, 21. These are increasing by 6. The next difference is 27. Therefore, 49+27=76.

This question belongs to: Reasoning Number Series

Question #138

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What will come in place of the question mark (?) in the following number series? 7, 16, 29, 46, ?

A. 65

B. 67

C. 63

D. 69

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Correct Answer: Option B

Explanation:
The differences are: 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 46+21=67.

This question belongs to: Reasoning Number Series

Question #139

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What will come in place of the question mark (?) in the following number series? 3, 7, 15, 31, ?

A. 67

B. 61

C. 65

D. 63

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (3×2)+1=7, (7×2)+1=15, (15×2)+1=31. The next term is (31×2)+1=63.

This question belongs to: Reasoning Number Series

Question #140

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What will come in place of the question mark (?) in the following number series? 12, 14, 18, 24, 32, ?

A. 42

B. 46

C. 44

D. 40

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Correct Answer: Option A

Explanation:
The differences are: 2, 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 32+10=42.

This question belongs to: Reasoning Number Series

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