What will come in place of the question mark (?) in the following number series? 5, 11, 21, 35, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 11, 21, 35, ?

A. 51

B. 49

C. 47

D. 53

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, 35+18=53.

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, 5, 8, 12, 17, ?

A. 23

B. 21

C. 24

D. 22

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Correct Answer: Option A

Explanation:
The differences are: 2, 3, 4, 5. The next difference is 6. Therefore, 17+6=23.

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? 3, 4, 7, 11, 18, ?

A. 29

B. 33

C. 31

D. 27

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Correct Answer: Option A

Explanation:
This is a Fibonacci-like series where each term is the sum of the previous two terms. 7+11=18, 11+18=29. The next term is 29.

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? 3, 15, 35, 63, ?

A. 80

B. 100

C. 99

D. 120

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Correct Answer: Option C

Explanation:
The pattern is: 1×3=3, 3×5=15, 5×7=35, 7×9=63. The next term is 9×11=99.

This question belongs to: Reasoning Number Series

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