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

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

A. 44

B. 42

C. 41

D. 43

Answer: Option D

Solution (By JKSSB Mock Tests)

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

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Question #1

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

A. 140

B. 150

C. 120

D. 130

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Correct Answer: Option D

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 #2

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

A. 84

B. 82

C. 78

D. 80

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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 #3

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

A. 234

B. 156

C. 182

D. 208

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Correct Answer: Option D

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

This question belongs to: Reasoning Number Series

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