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

Question #21

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What will come in place of the question mark (?) in the following number series? 3, 10, 20, 33, 49, 68, ?

A. 85

B. 91

C. 90

D. 75

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Correct Answer: Option C

Explanation:
The differences are: 7, 10, 13, 16, 19 (increasing by 3). The next difference is 22. Therefore, 68+22=90.[reference:17]

This question belongs to: Reasoning Number Series

Question #22

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What will come in place of the question mark (?) in the following number series? 1, 9, 25, 49, ?, 121

A. 100

B. 81

C. 72

D. 64

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Correct Answer: Option B

Explanation:
The series consists of squares of odd numbers: 1², 3², 5², 7², 9², 11². The missing term is 9²=81.[reference:18]

This question belongs to: Reasoning Number Series

Question #23

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What will come in place of the question mark (?) in the following number series? 8, 27, 64, 125, ?

A. 196

B. 256

C. 216

D. 144

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Correct Answer: Option C

Explanation:
The series consists of cubes of consecutive integers starting from 2: 2³, 3³, 4³, 5³. The next term is 6³=216.

This question belongs to: Reasoning Number Series

Question #24

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What will come in place of the question mark (?) in the following number series? 0, 6, 24, 60, 120, ?

A. 240

B. 360

C. 180

D. 210

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Correct Answer: Option D

Explanation:
The pattern is: 1³-1=0, 2³-2=6, 3³-3=24, 4³-4=60, 5³-5=120. The next term is 6³-6=210.

This question belongs to: Reasoning Number Series

Question #25

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

A. 80

B. 100

C. 120

D. 60

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Correct Answer: Option C

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

This question belongs to: Reasoning Number Series

Question #26

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

A. 162

B. 243

C. 324

D. 405

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Correct Answer: Option B

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

This question belongs to: Reasoning Number Series

Question #27

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What will come in place of the question mark (?) in the following number series? 2, 5, 11, 23, ?

A. 45

B. 47

C. 51

D. 49

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Correct Answer: Option B

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

This question belongs to: Reasoning Number Series

Question #28

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What will come in place of the question mark (?) in the following number series? 20, 18, 15, 11, ?

A. 6

B. 7

C. 5

D. 8

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Correct Answer: Option A

Explanation:
The differences are: -2, -3, -4. The next difference is -5. Therefore, 11-5=6.

This question belongs to: Reasoning Number Series

Question #29

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What will come in place of the question mark (?) in the following number series? 24, 30, 36, 42, ?

A. 48

B. 54

C. 50

D. 60

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Correct Answer: Option A

Explanation:
The series increases by 6 each time. Therefore, 42+6=48.

This question belongs to: Reasoning Number Series

Question #30

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What will come in place of the question mark (?) in the following number series? 1, 4, 10, 22, ?

A. 48

B. 42

C. 44

D. 46

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Correct Answer: Option D

Explanation:
The pattern is: (1×2)+2=4, (4×2)+2=10, (10×2)+2=22. The next term is (22×2)+2=46.

This question belongs to: Reasoning Number Series

Question #31

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What will come in place of the question mark (?) in the following number series? 4, 8, 12, 20, ?

A. 32

B. 24

C. 36

D. 28

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Correct Answer: Option A

Explanation:
The pattern alternates: +4, ×2? No, 4+4=8, 8+4=12, 12+8=20. Actually, it's adding consecutive even numbers: +4, +4, +8. But more precisely: 4+4=8, 8+4=12, 12+8=20, 20+12=32? Let's re-evaluate: The differences are 4, 4, 8, 12. Not a clear pattern. A better pattern: each term is the sum of the previous two terms? 4+8=12, 8+12=20, 12+20=32. Yes, this is a Fibonacci-like series. The next term is 12+20=32.

This question belongs to: Reasoning Number Series

Question #32

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What will come in place of the question mark (?) in the following number series? 7, 8, 10, 13, 17, ?

A. 21

B. 23

C. 20

D. 22

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Correct Answer: Option D

Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 17+5=22.

This question belongs to: Reasoning Number Series

Question #33

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What will come in place of the question mark (?) in the following number series? 6, 12, 20, 30, 42, ?

A. 58

B. 54

C. 56

D. 52

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Correct Answer: Option C

Explanation:
The pattern is: 1×2+4=6? Let's find differences: 6, 8, 10, 12. These are consecutive even numbers. The next difference is 14. Therefore, 42+14=56.

This question belongs to: Reasoning Number Series

Question #34

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

A. 42

B. 81

C. 64

D. 49

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Correct Answer: Option D

Explanation:
The series consists of squares of consecutive integers starting from 3: 3², 4², 5², 6². The next term is 7²=49.

This question belongs to: Reasoning Number Series

Question #35

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What will come in place of the question mark (?) in the following number series? 1, 2, 4, 7, 11, ?

A. 16

B. 14

C. 15

D. 18

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Correct Answer: Option A

Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 11+5=16.

This question belongs to: Reasoning Number Series

Question #36

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

A. 40

B. 33

C. 36

D. 35

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Correct Answer: Option D

Explanation:
The differences are: 5, 7, 9. The next difference is 11. Therefore, 24+11=35.

This question belongs to: Reasoning Number Series

Question #37

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What will come in place of the question mark (?) in the following number series? 1, 4, 9, 16, ?

A. 30

B. 20

C. 36

D. 25

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Correct Answer: Option D

Explanation:
The series consists of squares of consecutive integers: 1², 2², 3², 4². The next term is 5²=25.

This question belongs to: Reasoning Number Series

Question #38

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What will come in place of the question mark (?) in the following number series? 2, 8, 32, 128, ?

A. 640

B. 512

C. 256

D. 384

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Correct Answer: Option B

Explanation:
Each term is multiplied by 4. Therefore, 128×4=512.

This question belongs to: Reasoning Number Series

Question #39

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What will come in place of the question mark (?) in the following number series? 20, 10, 5, 2.5, ?

A. 1.5

B. 0.75

C. 1.25

D. 2

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Correct Answer: Option C

Explanation:
Each term is divided by 2. Therefore, 2.5/2=1.25.

This question belongs to: Reasoning Number Series

Question #40

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What will come in place of the question mark (?) in the following number series? 1, 8, 27, 64, 125, ?

A. 144

B. 169

C. 216

D. 196

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Correct Answer: Option C

Explanation:
The series consists of cubes of consecutive integers: 1³, 2³, 3³, 4³, 5³. The next term is 6³=216.

This question belongs to: Reasoning Number Series

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