What will come in place of the question mark (?) in the following number series? 3, 10, 20, 33, 49, 68, ? 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, 20, 33, 49, 68, ?

A. 90

B. 85

C. 91

D. 75

Answer: Option A

Solution (By JKExamLibrary)

The differences are: 7, 10, 13, 16, 19 (increasing by 3). The next difference is 22. Therefore, 68+22=90.[reference:17]

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? 5, 9, 17, 33, ?

A. 69

B. 67

C. 65

D. 63

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (5×2)-1=9, (9×2)-1=17, (17×2)-1=33. The next term is (33×2)-1=65.

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? 10, 17, 26, 37, ?

A. 49

B. 51

C. 50

D. 48

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Correct Answer: Option C

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 37+13=50.

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? 8, 10, 14, 20, ?

A. 30

B. 26

C. 28

D. 32

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Correct Answer: Option C

Explanation:
The differences are: 2, 4, 6. These are increasing by 2. The next difference is 8. Therefore, 20+8=28.

This question belongs to: Reasoning Number Series

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