What will come in place of the question mark (?) in the following number series? 3, 10, 21, 36, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 10, 21, 36, ?

A. 55

B. 51

C. 53

D. 57

Answer: Option A

Solution (By JKSSB Mock Tests)

The differences are: 7, 11, 15. These are increasing by 4. The next difference is 19. Therefore, 36+19=55.

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, 13, 28, 49, ?

A. 78

B. 74

C. 72

D. 76

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Correct Answer: Option D

Explanation:
The differences are: 9, 15, 21. These are increasing by 6. The next difference is 27. Therefore, 49+27=76.

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. 56

C. 54

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? 48, 24, 12, 6, ?

A. 2

B. 3

C. 1

D. 4

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Correct Answer: Option B

Explanation:
Each term is divided by 2. Therefore, 6/2=3.

This question belongs to: Reasoning Number Series

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