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. 73

B. 69

C. 71

D. 67

Answer: Option C

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? 1, 3, 9, 27, 81, ?

A. 162

B. 324

C. 405

D. 243

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Correct Answer: Option D

Explanation:
Each term is multiplied by 3. Therefore, 81×3=243.

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? 14, 27, 42, 59, ?

A. 76

B. 82

C. 80

D. 78

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Correct Answer: Option D

Explanation:
The differences are: 13, 15, 17. These are increasing by 2. The next difference is 19. Therefore, 59+19=78.

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? 4, 9, 16, 25, ?

A. 30

B. 42

C. 36

D. 49

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Correct Answer: Option C

Explanation:
The series consists of squares of consecutive integers: 2²=4, 3²=9, 4²=16, 5²=25. The next number should be the square of 6, which is 36.[reference:2]

This question belongs to: Reasoning Number Series

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