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

Question #41

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What will come in place of the question mark (?) in the following number series? 11, 13, 17, 19, 23, ?

A. 31

B. 27

C. 29

D. 25

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Correct Answer: Option C

Explanation:
The series consists of consecutive prime numbers. The next prime number after 23 is 29.

This question belongs to: Reasoning Number Series

Question #42

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What will come in place of the question mark (?) in the following number series? 4, 12, 24, 40, ?

A. 56

B. 60

C. 64

D. 72

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Correct Answer: Option B

Explanation:
The differences are: 8, 12, 16. These are increasing by 4. The next difference is 20. Therefore, 40+20=60.

This question belongs to: Reasoning Number Series

Question #43

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What will come in place of the question mark (?) in the following number series? 6, 14, 24, 36, ?

A. 48

B. 50

C. 54

D. 52

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Correct Answer: Option B

Explanation:
The differences are: 8, 10, 12. These are increasing by 2. The next difference is 14. Therefore, 36+14=50.

This question belongs to: Reasoning Number Series

Question #44

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What will come in place of the question mark (?) in the following number series? 5, 8, 12, 17, ?

A. 24

B. 21

C. 22

D. 23

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Correct Answer: Option D

Explanation:
The differences are: 3, 4, 5. The next difference is 6. Therefore, 17+6=23.

This question belongs to: Reasoning Number Series

Question #45

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

A. 51

B. 48

C. 50

D. 49

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Correct Answer: Option C

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 37+13=50.

This question belongs to: Reasoning Number Series

Question #46

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What will come in place of the question mark (?) in the following number series? 3, 15, 35, 63, ?

A. 120

B. 100

C. 99

D. 80

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Correct Answer: Option C

Explanation:
The pattern is: 1×3=3, 3×5=15, 5×7=35, 7×9=63. The next term is 9×11=99.

This question belongs to: Reasoning Number Series

Question #47

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What will come in place of the question mark (?) in the following number series? 0, 7, 26, 63, ?

A. 124

B. 126

C. 125

D. 127

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Correct Answer: Option A

Explanation:
The pattern is: 1³-1=0, 2³-1=7, 3³-1=26, 4³-1=63. The next term is 5³-1=124.

This question belongs to: Reasoning Number Series

Question #48

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What will come in place of the question mark (?) in the following number series? 1, 3, 9, 27, 81, ?

A. 162

B. 405

C. 243

D. 324

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Correct Answer: Option C

Explanation:
Each term is multiplied by 3. Therefore, 81×3=243.

This question belongs to: Reasoning Number Series

Question #49

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What will come in place of the question mark (?) in the following number series? 6, 13, 27, 55, ?

A. 111

B. 109

C. 112

D. 110

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (6×2)+1=13, (13×2)+1=27, (27×2)+1=55. The next term is (55×2)+1=111.

This question belongs to: Reasoning Number Series

Question #50

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What will come in place of the question mark (?) in the following number series? 50, 49, 47, 44, ?

A. 43

B. 42

C. 40

D. 41

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Correct Answer: Option C

Explanation:
The differences are: -1, -2, -3. The next difference is -4. Therefore, 44-4=40.

This question belongs to: Reasoning Number Series

Question #51

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What will come in place of the question mark (?) in the following number series? 2, 12, 30, 56, ?

A. 110

B. 80

C. 90

D. 100

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Correct Answer: Option C

Explanation:
The pattern is: 1×2=2, 3×4=12, 5×6=30, 7×8=56. The next term is 9×10=90.

This question belongs to: Reasoning Number Series

Question #52

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What will come in place of the question mark (?) in the following number series? 10, 30, 60, 100, ?

A. 140

B. 160

C. 120

D. 150

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Correct Answer: Option D

Explanation:
The differences are: 20, 30, 40. These are increasing by 10. The next difference is 50. Therefore, 100+50=150.

This question belongs to: Reasoning Number Series

Question #53

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What will come in place of the question mark (?) in the following number series? 1, 5, 14, 30, 55, ?

A. 91

B. 90

C. 85

D. 80

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Correct Answer: Option A

Explanation:
The differences are: 4, 9, 16, 25. These are squares of consecutive integers: 2², 3², 4², 5². The next difference is 6²=36. Therefore, 55+36=91.

This question belongs to: Reasoning Number Series

Question #54

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What will come in place of the question mark (?) in the following number series? 2, 10, 30, 68, ?

A. 120

B. 140

C. 130

D. 150

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Correct Answer: Option C

Explanation:
The pattern is: 1³+1=2, 2³+2=10, 3³+3=30, 4³+4=68. The next term is 5³+5=130.

This question belongs to: Reasoning Number Series

Question #55

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What will come in place of the question mark (?) in the following number series? 3, 5, 9, 17, ?

A. 33

B. 29

C. 35

D. 31

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (3×2)-1=5, (5×2)-1=9, (9×2)-1=17. The next term is (17×2)-1=33.

This question belongs to: Reasoning Number Series

Question #56

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What will come in place of the question mark (?) in the following number series? 4, 12, 36, 108, ?

A. 432

B. 216

C. 324

D. 540

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Correct Answer: Option C

Explanation:
Each term is multiplied by 3. Therefore, 108×3=324.

This question belongs to: Reasoning Number Series

Question #57

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What will come in place of the question mark (?) in the following number series? 20, 25, 35, 50, ?

A. 75

B. 65

C. 70

D. 60

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Correct Answer: Option C

Explanation:
The differences are: 5, 10, 15. These are increasing by 5. The next difference is 20. Therefore, 50+20=70.

This question belongs to: Reasoning Number Series

Question #58

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What will come in place of the question mark (?) in the following number series? 4, 11, 21, 34, ?

A. 49

B. 48

C. 50

D. 47

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Correct Answer: Option C

Explanation:
The differences are: 7, 10, 13. These are increasing by 3. The next difference is 16. Therefore, 34+16=50.

This question belongs to: Reasoning Number Series

Question #59

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What will come in place of the question mark (?) in the following number series? 7, 13, 21, 31, ?

A. 41

B. 42

C. 44

D. 43

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Correct Answer: Option D

Explanation:
The differences are: 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 31+12=43.

This question belongs to: Reasoning Number Series

Question #60

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What will come in place of the question mark (?) in the following number series? 10, 20, 40, 80, ?

A. 120

B. 140

C. 180

D. 160

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2. Therefore, 80×2=160.

This question belongs to: Reasoning Number Series

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