What will come in place of the question mark (?) in the following number series? 4, 11, 21, 34, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 11, 21, 34, ?

A. 48

B. 47

C. 49

D. 50

Answer: Option D

Solution (By JKExamLibrary)

The differences are: 7, 10, 13. These are increasing by 3. The next difference is 16. Therefore, 34+16=50.

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? 6, 18, 34, 54, 78, ?

A. 100

B. 106

C. 98

D. 102

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Correct Answer: Option B

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 78+28=106.

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? 2, 12, 30, 56, ?

A. 90

B. 80

C. 100

D. 110

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Correct Answer: Option A

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

Question #3

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What will come in place of the question mark (?) in the following number series? 2, 6, 10, 14, 18, ?

A. 24

B. 26

C. 22

D. 20

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Correct Answer: Option C

Explanation:
The series increases by 4 each time. Therefore, 18+4=22.

This question belongs to: Reasoning Number Series

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