What will come in place of the question mark (?) in the following number series? 3, 9, 19, 33, 51, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 9, 19, 33, 51, ?

A. 71

B. 73

C. 69

D. 67

Answer: Option A

Solution (By JKSSB Mock Tests)

The differences are: 6, 10, 14, 18. These are increasing by 4. The next difference is 22. Therefore, 51+22=73.

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? 4, 11, 21, 34, ?

A. 48

B. 49

C. 50

D. 47

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Correct Answer: Option C

Explanation:
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

Question #2

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What will come in place of the question mark (?) in the following number series? 2, 5, 12, 27, ?

A. 60

B. 54

C. 56

D. 58

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 1, then 2, then 3? Let's check: (2×2)+1=5, (5×2)+2=12, (12×2)+3=27. The next term is (27×2)+4=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? 7, 10, 15, 22, ?

A. 35

B. 29

C. 33

D. 31

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Correct Answer: Option D

Explanation:
The differences are: 3, 5, 7. These are consecutive odd numbers. The next difference is 9. Therefore, 22+9=31.

This question belongs to: Reasoning Number Series

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