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

Question #1

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What will come in place of the question mark (?) in the following number series? 2, 3, 5, 7, ?

A. 8

B. 11

C. 10

D. 9

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Correct Answer: Option B

Explanation:
The given series consists of consecutive prime numbers. The prime numbers in order are 2, 3, 5, 7, 11, 13... Therefore, the next prime number after 7 is 11.[reference:0]

This question belongs to: Reasoning Number Series

Question #2

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What will come in place of the question mark (?) in the following number series? 1, 3, 6, 10, 15, ?

A. 20

B. 18

C. 17

D. 21

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Correct Answer: Option D

Explanation:
The differences between consecutive terms are: 3-1=2, 6-3=3, 10-6=4, 15-10=5. The differences are increasing by 1 each time. The next difference should be 6. Therefore, the next term is 15+6=21.[reference:1]

This question belongs to: Reasoning Number Series

Question #3

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

A. 30

B. 42

C. 36

D. 49

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Correct Answer: Option C

Explanation:
The series consists of squares of consecutive integers: 2²=4, 3²=9, 4²=16, 5²=25. The next number should be the square of 6, which is 36.[reference:2]

This question belongs to: Reasoning Number Series

Question #4

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What will come in place of the question mark (?) in the following number series? 7, 11, 13, 17, 19, 23, ?

A. 29

B. 28

C. 18

D. 27

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Correct Answer: Option A

Explanation:
The series consists of consecutive prime numbers starting from 7: 7, 11, 13, 17, 19, 23, 29. Therefore, the next prime number after 23 is 29.[reference:3]

This question belongs to: Reasoning Number Series

Question #5

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What will come in place of the question mark (?) in the following number series? 41, 43, 47, 53, 59, ?

A. 61

B. 64

C. 65

D. 67

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Correct Answer: Option A

Explanation:
The series consists of consecutive prime numbers. The prime number immediately following 59 is 61.[reference:4]

This question belongs to: Reasoning Number Series

Question #6

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What will come in place of the question mark (?) in the following number series? 3, 6, 11, 18, 27, ?

A. 36

B. 35

C. 29

D. 38

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Correct Answer: Option D

Explanation:
The differences between consecutive terms are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference should be 11. Therefore, the next term is 27+11=38.[reference:5]

This question belongs to: Reasoning Number Series

Question #7

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What will come in place of the question mark (?) in the following number series? 2, 6, 12, 20, 30, 42, ?

A. 56

B. 50

C. 52

D. 54

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Correct Answer: Option A

Explanation:
The differences between consecutive terms are: 4, 6, 8, 10, 12. These are consecutive even numbers. The next difference should be 14. Therefore, the next term is 42+14=56.[reference:6]

This question belongs to: Reasoning Number Series

Question #8

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What will come in place of the question mark (?) in the following number series? 5, 10, 15, 20, ?

A. 24

B. 22

C. 30

D. 25

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Correct Answer: Option D

Explanation:
The series is increasing by 5 each time. Therefore, the next term is 20+5=25.[reference:7]

This question belongs to: Reasoning Number Series

Question #9

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What will come in place of the question mark (?) in the following number series? 2, 9, 28, 65, ?

A. 126

B. 125

C. 127

D. 124

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Correct Answer: Option A

Explanation:
The pattern is: 1³+1=2, 2³+1=9, 3³+1=28, 4³+1=65. The next term is 5³+1=126.[reference:8]

This question belongs to: Reasoning Number Series

Question #10

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What will come in place of the question mark (?) in the following number series? 1, 4, 9, 16, 25, ?

A. 49

B. 35

C. 30

D. 36

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Correct Answer: Option D

Explanation:
The series consists of squares of consecutive integers: 1², 2², 3², 4², 5². The next term is 6²=36.

This question belongs to: Reasoning Number Series

Question #11

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

A. 100

B. 125

C. 121

D. 216

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Correct Answer: Option B

Explanation:
The series consists of cubes of consecutive integers: 1³, 2³, 3³, 4³. The next term is 5³=125.

This question belongs to: Reasoning Number Series

Question #12

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

A. 30

B. 24

C. 32

D. 64

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Correct Answer: Option C

Explanation:
Each term is multiplied by 2 to get the next term. Therefore, the next term is 16×2=32.

This question belongs to: Reasoning Number Series

Question #13

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What will come in place of the question mark (?) in the following number series? 1, 1, 2, 3, 5, 8, 13, ?

A. 20

B. 24

C. 21

D. 18

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Correct Answer: Option C

Explanation:
This is a Fibonacci series where each term is the sum of the previous two terms. 13+8=21.[reference:9]

This question belongs to: Reasoning Number Series

Question #14

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

A. 28

B. 25

C. 24

D. 26

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Correct Answer: Option D

Explanation:
The differences are: 3, 5, 7 (consecutive odd numbers). The next difference should be 9. Therefore, 17+9=26.

This question belongs to: Reasoning Number Series

Question #15

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What will come in place of the question mark (?) in the following number series? 1, 3, 7, 15, ?

A. 35

B. 32

C. 30

D. 31

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Correct Answer: Option D

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

This question belongs to: Reasoning Number Series

Question #16

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What will come in place of the question mark (?) in the following number series? 2, 6, 18, 54, ?

A. 216

B. 324

C. 162

D. 108

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Correct Answer: Option C

Explanation:
Each term is multiplied by 3 to get the next term. Therefore, 54×3=162.[reference:10]

This question belongs to: Reasoning Number Series

Question #17

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What will come in place of the question mark (?) in the following number series? 11, 22, 55, 165, ?

A. 333.5

B. 325.5

C. 495.5

D. 577.5

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Correct Answer: Option D

Explanation:
The pattern is: 11×2=22, 22×2.5=55, 55×3=165. The multiplier increases by 0.5 each time. The next multiplier is 3.5. Therefore, 165×3.5=577.5.[reference:11]

This question belongs to: Reasoning Number Series

Question #18

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What will come in place of the question mark (?) in the following number series? 4, 6, 12, 14, 28, 30, ?

A. 62

B. 60

C. 64

D. 32

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Correct Answer: Option B

Explanation:
The pattern alternates: +2, ×2, +2, ×2, +2, ×2. The last operation is ×2. Therefore, 30×2=60.[reference:14]

This question belongs to: Reasoning Number Series

Question #19

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What will come in place of the question mark (?) in the following number series? 2, 7, 14, 23, ?, 47

A. 34

B. 38

C. 31

D. 28

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Correct Answer: Option A

Explanation:
The differences are: 5, 7, 9, 11, 13 (consecutive odd numbers). The missing term is 23+11=34.[reference:15]

This question belongs to: Reasoning Number Series

Question #20

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What will come in place of the question mark (?) in the following number series? 2, 6, 11, 17, ?, 32

A. 23

B. 24

C. 22

D. 28

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Correct Answer: Option B

Explanation:
The differences are: 4, 5, 6, 7, 8. The missing term is 17+7=24.[reference:16]

This question belongs to: Reasoning Number Series

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