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

Question #81

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What will come in place of the question mark (?) in the following number series? 2, 5, 10, 17, 26, ?

A. 38

B. 37

C. 36

D. 35

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Correct Answer: Option B

Explanation:
The pattern is: 1²+1=2, 2²+1=5, 3²+1=10, 4²+1=17, 5²+1=26. The next term is 6²+1=37.

This question belongs to: Reasoning Number Series

Question #82

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What will come in place of the question mark (?) in the following number series? 4, 7, 13, 25, ?

A. 51

B. 49

C. 53

D. 55

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (4×2)-1=7, (7×2)-1=13, (13×2)-1=25. The next term is (25×2)-1=49.

This question belongs to: Reasoning Number Series

Question #83

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What will come in place of the question mark (?) in the following number series? 10, 14, 22, 34, ?

A. 48

B. 46

C. 52

D. 50

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Correct Answer: Option D

Explanation:
The differences are: 4, 8, 12. These are increasing by 4. The next difference is 16. Therefore, 34+16=50.

This question belongs to: Reasoning Number Series

Question #84

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What will come in place of the question mark (?) in the following number series? 9, 18, 36, 72, ?

A. 180

B. 108

C. 216

D. 144

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2. Therefore, 72×2=144.

This question belongs to: Reasoning Number Series

Question #85

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What will come in place of the question mark (?) in the following number series? 2, 12, 36, 80, ?

A. 160

B. 150

C. 180

D. 170

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Correct Answer: Option B

Explanation:
The pattern is: 1×2=2, 2×6=12, 3×12=36, 4×20=80. The multipliers are 2,6,12,20 which are n(n+1) for n=1,2,3,4. For n=5, 5×30=150.

This question belongs to: Reasoning Number Series

Question #86

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What will come in place of the question mark (?) in the following number series? 3, 11, 27, 59, ?

A. 125

B. 127

C. 121

D. 123

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 5. (3×2)+5=11, (11×2)+5=27, (27×2)+5=59. The next term is (59×2)+5=123.

This question belongs to: Reasoning Number Series

Question #87

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What will come in place of the question mark (?) in the following number series? 2, 5, 9, 14, 20, ?

A. 26

B. 27

C. 28

D. 25

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Correct Answer: Option B

Explanation:
The differences are: 3, 4, 5, 6. The next difference is 7. Therefore, 20+7=27.

This question belongs to: Reasoning Number Series

Question #88

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What will come in place of the question mark (?) in the following number series? 3, 8, 18, 38, ?

A. 80

B. 82

C. 78

D. 84

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and adding 2. (3×2)+2=8, (8×2)+2=18, (18×2)+2=38. The next term is (38×2)+2=78.

This question belongs to: Reasoning Number Series

Question #89

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What will come in place of the question mark (?) in the following number series? 11, 15, 19, 23, ?

A. 29

B. 27

C. 31

D. 25

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Correct Answer: Option B

Explanation:
The series increases by 4 each time. Therefore, 23+4=27.

This question belongs to: Reasoning Number Series

Question #90

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What will come in place of the question mark (?) in the following number series? 12, 18, 26, 36, ?

A. 48

B. 50

C. 46

D. 44

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Correct Answer: Option A

Explanation:
The differences are: 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 36+12=48.

This question belongs to: Reasoning Number Series

Question #91

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What will come in place of the question mark (?) in the following number series? 7, 10, 15, 22, ?

A. 33

B. 31

C. 29

D. 35

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Correct Answer: Option B

Explanation:
The differences are: 3, 5, 7. These are consecutive odd numbers. The next difference is 9. Therefore, 22+9=31.

This question belongs to: Reasoning Number Series

Question #92

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What will come in place of the question mark (?) in the following number series? 5, 10, 20, 40, ?

A. 70

B. 90

C. 80

D. 60

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Correct Answer: Option C

Explanation:
Each term is multiplied by 2. Therefore, 40×2=80.

This question belongs to: Reasoning Number Series

Question #93

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What will come in place of the question mark (?) in the following number series? 2, 4, 12, 48, ?

A. 144

B. 240

C. 192

D. 288

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Correct Answer: Option B

Explanation:
The pattern is: 2×2=4, 4×3=12, 12×4=48. The multipliers are increasing by 1. The next multiplier is 5. Therefore, 48×5=240.

This question belongs to: Reasoning Number Series

Question #94

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

A. 36

B. 40

C. 38

D. 34

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Correct Answer: Option C

Explanation:
The differences are: 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 27+11=38.

This question belongs to: Reasoning Number Series

Question #95

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What will come in place of the question mark (?) in the following number series? 13, 26, 52, 104, ?

A. 208

B. 234

C. 182

D. 156

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2. Therefore, 104×2=208.

This question belongs to: Reasoning Number Series

Question #96

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What will come in place of the question mark (?) in the following number series? 1, 6, 15, 28, ?

A. 48

B. 45

C. 42

D. 40

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Correct Answer: Option B

Explanation:
The pattern is: 1×1=1, 2×3=6, 3×5=15, 4×7=28. The next term is 5×9=45.

This question belongs to: Reasoning Number Series

Question #97

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What will come in place of the question mark (?) in the following number series? 3, 12, 27, 48, ?

A. 72

B. 75

C. 63

D. 60

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Correct Answer: Option B

Explanation:
The pattern is: 3×1²=3, 3×2²=12, 3×3²=27, 3×4²=48. The next term is 3×5²=75.

This question belongs to: Reasoning Number Series

Question #98

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What will come in place of the question mark (?) in the following number series? 5, 12, 20, 29, ?

A. 38

B. 37

C. 40

D. 39

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Correct Answer: Option D

Explanation:
The differences are: 7, 8, 9. The next difference is 10. Therefore, 29+10=39.

This question belongs to: Reasoning Number Series

Question #99

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What will come in place of the question mark (?) in the following number series? 4, 6, 9, 13, ?

A. 17

B. 16

C. 19

D. 18

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Correct Answer: Option D

Explanation:
The differences are: 2, 3, 4. The next difference is 5. Therefore, 13+5=18.

This question belongs to: Reasoning Number Series

Question #100

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What will come in place of the question mark (?) in the following number series? 7, 14, 28, 56, ?

A. 84

B. 112

C. 98

D. 126

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Correct Answer: Option B

Explanation:
Each term is multiplied by 2. Therefore, 56×2=112.

This question belongs to: Reasoning Number Series

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