What will come in place of the question mark (?) in the following number series? 4, 12, 24, 40, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 12, 24, 40, ?

A. 56

B. 72

C. 60

D. 64

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 8, 12, 16. These are increasing by 4. The next difference is 20. Therefore, 40+20=60.

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, 9, 19, 39, ?

A. 77

B. 79

C. 81

D. 83

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (4×2)+1=9, (9×2)+1=19, (19×2)+1=39. The next term is (39×2)+1=79.

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, 10, 17, 26, ?

A. 36

B. 38

C. 37

D. 35

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Correct Answer: Option C

Explanation:
The pattern is: 1²+1=2, 2²+1=5, 3²+1=10, 4²+1=17, 5²+1=26. The next term is 6²+1=37.

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? 7, 14, 28, 56, ?

A. 126

B. 112

C. 98

D. 84

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Correct Answer: Option B

Explanation:
Each term is multiplied by 2. Therefore, 56×2=112.

This question belongs to: Reasoning Number Series

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