What will come in place of the question mark (?) in the following number series? 7, 10, 15, 22, 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, 10, 15, 22, 31, ?

A. 38

B. 44

C. 40

D. 42

Answer: Option D

Solution (By JKExamLibrary)

The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 31+11=42.

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? 3, 10, 21, 36, ?

A. 57

B. 55

C. 53

D. 51

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Correct Answer: Option B

Explanation:
The differences are: 7, 11, 15. These are increasing by 4. The next difference is 19. Therefore, 36+19=55.

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, 11, 27, 59, 123, ?

A. 253

B. 247

C. 249

D. 251

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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, (59×2)+5=123. The next term is (123×2)+5=251.

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? 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

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