What will come in place of the question mark (?) in the following number series? 3, 11, 27, 59, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 11, 27, 59, ?

A. 123

B. 127

C. 125

D. 121

Answer: Option A

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and adding 5. (3×2)+5=11, (11×2)+5=27, (27×2)+5=59. The next term is (59×2)+5=123.

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? 10, 20, 40, 80, ?

A. 160

B. 140

C. 120

D. 180

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2. Therefore, 80×2=160.

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? 3, 8, 15, 24, 35, ?

A. 46

B. 50

C. 48

D. 52

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Correct Answer: Option C

Explanation:
The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 35+13=48.

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, ?

A. 33

B. 31

C. 35

D. 29

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Correct Answer: Option B

Explanation:
The differences are: 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 21+10=31.

This question belongs to: Reasoning Number Series

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