What will come in place of the question mark (?) in the following number series? 3, 5, 9, 17, 33, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 5, 9, 17, 33, ?

A. 67

B. 61

C. 65

D. 63

Answer: Option C

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and subtracting 1. (3×2)-1=5, (5×2)-1=9, (9×2)-1=17, (17×2)-1=33. The next term is (33×2)-1=65.

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? 3, 11, 23, 39, 59, ?

A. 81

B. 83

C. 79

D. 77

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Correct Answer: Option B

Explanation:
The differences are: 8, 12, 16, 20. These are increasing by 4. The next difference is 24. Therefore, 59+24=83.

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, 6, 12, 20, 30, ?

A. 44

B. 40

C. 46

D. 42

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Correct Answer: Option D

Explanation:
The differences are: 4, 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 30+12=42.

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? 8, 15, 24, 35, ?

A. 46

B. 52

C. 50

D. 48

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Correct Answer: Option D

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 35+13=48.

This question belongs to: Reasoning Number Series

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