What will come in place of the question mark (?) in the following number series? 4, 10, 20, 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, 10, 20, 34, ?

A. 50

B. 48

C. 54

D. 52

Answer: Option D

Solution (By JKSSB Mock Tests)

The differences are: 6, 10, 14. These are increasing by 4. The next difference is 18. Therefore, 34+18=52.

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? 7, 14, 23, 34, ?

A. 43

B. 49

C. 47

D. 45

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Correct Answer: Option C

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 34+13=47.

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? 4, 13, 28, 49, ?

A. 78

B. 74

C. 72

D. 76

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Correct Answer: Option D

Explanation:
The differences are: 9, 15, 21. These are increasing by 6. The next difference is 27. Therefore, 49+27=76.

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? 1, 1, 2, 3, 5, 8, 13, ?

A. 20

B. 24

C. 18

D. 21

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Correct Answer: Option D

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

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