What will come in place of the question mark (?) in the following number series? 7, 13, 25, 49, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 7, 13, 25, 49, ?

A. 97

B. 103

C. 99

D. 101

Answer: Option A

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and subtracting 1. (7×2)-1=13, (13×2)-1=25, (25×2)-1=49. The next term is (49×2)-1=97.

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? 1, 4, 10, 22, ?

A. 44

B. 46

C. 48

D. 42

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Correct Answer: Option B

Explanation:
The pattern is: (1×2)+2=4, (4×2)+2=10, (10×2)+2=22. The next term is (22×2)+2=46.

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? 1, 6, 15, 28, ?

A. 45

B. 40

C. 48

D. 42

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Correct Answer: Option A

Explanation:
The pattern is: 1×1=1, 2×3=6, 3×5=15, 4×7=28. The next term is 5×9=45.

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, 7, 13, 21, 31, ?

A. 45

B. 41

C. 39

D. 43

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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, 31+12=43.

This question belongs to: Reasoning Number Series

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