What will come in place of the question mark (?) in the following number series? 3, 4, 6, 9, 13, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 4, 6, 9, 13, ?

A. 19

B. 20

C. 18

D. 17

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 13+5=18.

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? 2, 8, 18, 32, 50, ?

A. 74

B. 70

C. 68

D. 72

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Correct Answer: Option D

Explanation:
The pattern is: 2×1²=2, 2×2²=8, 2×3²=18, 2×4²=32, 2×5²=50. The next term is 2×6²=72.

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? 6, 13, 22, 33, 46, ?

A. 63

B. 59

C. 57

D. 61

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Correct Answer: Option D

Explanation:
The differences are: 7, 9, 11, 13. These are consecutive odd numbers. The next difference is 15. Therefore, 46+15=61.

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, 8, 16, 32, ?

A. 48

B. 64

C. 56

D. 72

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Correct Answer: Option B

Explanation:
Each term is multiplied by 2. Therefore, 32×2=64.

This question belongs to: Reasoning Number Series

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