What will come in place of the question mark (?) in the following number series? 5, 15, 29, 47, 69, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 15, 29, 47, 69, ?

A. 89

B. 95

C. 87

D. 91

Answer: Option B

Solution (By JKSSB Mock Tests)

The differences are: 10, 14, 18, 22. These are increasing by 4. The next difference is 26. Therefore, 69+26=95.

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? 8, 18, 32, 50, ?

A. 74

B. 72

C. 68

D. 70

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Correct Answer: Option B

Explanation:
The pattern is: 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? 4, 7, 13, 25, ?

A. 49

B. 53

C. 55

D. 51

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (4×2)-1=7, (7×2)-1=13, (13×2)-1=25. The next term is (25×2)-1=49.

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? 1, 1, 2, 3, 5, 8, 13, ?

A. 18

B. 20

C. 21

D. 24

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Correct Answer: Option C

Explanation:
This is a Fibonacci series where each term is the sum of the previous two terms. 13+8=21.[reference:9]

This question belongs to: Reasoning Number Series

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