What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, ?

A. 29

B. 33

C. 31

D. 35

Answer: Option C

Solution (By JKExamLibrary)

The differences are: 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 21+10=31.

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? 9, 17, 27, 39, 53, ?

A. 71

B. 65

C. 69

D. 67

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Correct Answer: Option C

Explanation:
The differences are: 8, 10, 12, 14. These are increasing by 2. The next difference is 16. Therefore, 53+16=69.

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? 6, 13, 24, 39, ?

A. 60

B. 58

C. 56

D. 54

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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, 39+19=58.

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, 10, 30, 68, 130, ?

A. 200

B. 222

C. 210

D. 220

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Correct Answer: Option B

Explanation:
The pattern is: 1³+1=2, 2³+2=10, 3³+3=30, 4³+4=68, 5³+5=130. The next term is 6³+6=222.

This question belongs to: Reasoning Number Series

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