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

Question #61

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What will come in place of the question mark (?) in the following number series? 2, 6, 14, 30, ?

A. 56

B. 62

C. 58

D. 46

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Correct Answer: Option B

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

This question belongs to: Reasoning Number Series

Question #62

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What will come in place of the question mark (?) in the following number series? 48, 24, 12, 6, ?

A. 4

B. 1

C. 2

D. 3

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Correct Answer: Option D

Explanation:
Each term is divided by 2. Therefore, 6/2=3.

This question belongs to: Reasoning Number Series

Question #63

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What will come in place of the question mark (?) in the following number series? 1, 10, 100, ?

A. 1000

B. 10000

C. 2000

D. 500

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Correct Answer: Option A

Explanation:
Each term is multiplied by 10. Therefore, 100×10=1000.

This question belongs to: Reasoning Number Series

Question #64

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What will come in place of the question mark (?) in the following number series? 6, 18, 54, 162, ?

A. 486

B. 324

C. 810

D. 648

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Correct Answer: Option A

Explanation:
Each term is multiplied by 3. Therefore, 162×3=486.

This question belongs to: Reasoning Number Series

Question #65

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What will come in place of the question mark (?) in the following number series? 5, 11, 23, 47, ?

A. 99

B. 93

C. 95

D. 97

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (5×2)+1=11, (11×2)+1=23, (23×2)+1=47. The next term is (47×2)+1=95.

This question belongs to: Reasoning Number Series

Question #66

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

A. 50

B. 46

C. 52

D. 48

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Correct Answer: Option D

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 35+13=48.

This question belongs to: Reasoning Number Series

Question #67

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What will come in place of the question mark (?) in the following number series? 12, 24, 48, 96, ?

A. 216

B. 144

C. 168

D. 192

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2. Therefore, 96×2=192.

This question belongs to: Reasoning Number Series

Question #68

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What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, ?

A. 31

B. 29

C. 33

D. 35

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Correct Answer: Option A

Explanation:
The differences are: 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 21+10=31.

This question belongs to: Reasoning Number Series

Question #69

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What will come in place of the question mark (?) in the following number series? 14, 21, 28, 35, ?

A. 42

B. 40

C. 41

D. 45

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Correct Answer: Option A

Explanation:
The series increases by 7 each time. Therefore, 35+7=42.

This question belongs to: Reasoning Number Series

Question #70

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What will come in place of the question mark (?) in the following number series? 9, 10, 12, 15, 19, ?

A. 24

B. 25

C. 22

D. 23

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Correct Answer: Option A

Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 19+5=24.

This question belongs to: Reasoning Number Series

Question #71

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What will come in place of the question mark (?) in the following number series? 3, 6, 12, 24, 48, ?

A. 108

B. 72

C. 84

D. 96

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2. Therefore, 48×2=96.

This question belongs to: Reasoning Number Series

Question #72

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

A. 0.5

B. 2

C. 1

D. 1.5

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Correct Answer: Option C

Explanation:
Each term is divided by 2. Therefore, 2/2=1.

This question belongs to: Reasoning Number Series

Question #73

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What will come in place of the question mark (?) in the following number series? 2, 3, 6, 11, 18, ?

A. 27

B. 29

C. 31

D. 25

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Correct Answer: Option A

Explanation:
The differences are: 1, 3, 5, 7. These are consecutive odd numbers. The next difference is 9. Therefore, 18+9=27.

This question belongs to: Reasoning Number Series

Question #74

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What will come in place of the question mark (?) in the following number series? 4, 16, 36, 64, ?

A. 121

B. 144

C. 81

D. 100

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Correct Answer: Option D

Explanation:
The series consists of squares of even numbers: 2², 4², 6², 8². The next term is 10²=100.

This question belongs to: Reasoning Number Series

Question #75

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What will come in place of the question mark (?) in the following number series? 1, 2, 6, 24, 120, ?

A. 600

B. 840

C. 480

D. 720

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Correct Answer: Option D

Explanation:
The pattern is: 1×1=1, 1×2=2, 2×3=6, 6×4=24, 24×5=120. The next term is 120×6=720.

This question belongs to: Reasoning Number Series

Question #76

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What will come in place of the question mark (?) in the following number series? 9, 25, 49, 81, ?

A. 169

B. 121

C. 100

D. 144

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Correct Answer: Option B

Explanation:
The series consists of squares of odd numbers: 3², 5², 7², 9². The next term is 11²=121.

This question belongs to: Reasoning Number Series

Question #77

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What will come in place of the question mark (?) in the following number series? 2, 8, 18, 32, ?

A. 50

B. 48

C. 40

D. 42

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Correct Answer: Option A

Explanation:
The pattern is: 2×1²=2, 2×2²=8, 2×3²=18, 2×4²=32. The next term is 2×5²=50.

This question belongs to: Reasoning Number Series

Question #78

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What will come in place of the question mark (?) in the following number series? 5, 12, 21, 32, ?

A. 45

B. 43

C. 47

D. 41

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Correct Answer: Option A

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 32+13=45.

This question belongs to: Reasoning Number Series

Question #79

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What will come in place of the question mark (?) in the following number series? 14, 27, 42, 59, ?

A. 78

B. 80

C. 76

D. 82

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Correct Answer: Option A

Explanation:
The differences are: 13, 15, 17. These are increasing by 2. The next difference is 19. Therefore, 59+19=78.

This question belongs to: Reasoning Number Series

Question #80

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What will come in place of the question mark (?) in the following number series? 4, 9, 16, 25, 36, ?

A. 44

B. 42

C. 56

D. 49

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Correct Answer: Option D

Explanation:
The series consists of squares of consecutive integers: 2², 3², 4², 5², 6². The next term is 7²=49.

This question belongs to: Reasoning Number Series

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