What will come in place of the question mark (?) in the following number series? 1, 3, 7, 15, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 1, 3, 7, 15, ?

A. 31

B. 32

C. 35

D. 30

Answer: Option A

Solution (By JKExamLibrary)

Each term is obtained by multiplying the previous term by 2 and adding 1. (1×2)+1=3, (3×2)+1=7, (7×2)+1=15. The next term is (15×2)+1=31.

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? 6, 13, 22, 33, ?

A. 46

B. 43

C. 44

D. 42

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Correct Answer: Option A

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 33+13=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? 41, 43, 47, 53, 59, ?

A. 67

B. 65

C. 61

D. 64

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Correct Answer: Option C

Explanation:
The series consists of consecutive prime numbers. The prime number immediately following 59 is 61.[reference:4]

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? 2, 14, 30, 50, 74, ?

A. 94

B. 98

C. 102

D. 96

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Correct Answer: Option C

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 74+28=102.

This question belongs to: Reasoning Number Series

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