What will come in place of the question mark (?) in the following number series? 1, 3, 9, 27, 81, ? 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, 9, 27, 81, ?

A. 405

B. 324

C. 243

D. 162

Answer: Option C

Solution (By JKSSB Mock Tests)

Each term is multiplied by 3. Therefore, 81×3=243.

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? 2, 6, 12, 20, 30, 42, ?

A. 54

B. 52

C. 50

D. 56

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Correct Answer: Option D

Explanation:
The differences between consecutive terms are: 4, 6, 8, 10, 12. These are consecutive even numbers. The next difference should be 14. Therefore, the next term is 42+14=56.[reference:6]

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? 2, 4, 8, 14, 22, ?

A. 30

B. 34

C. 32

D. 36

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Correct Answer: Option C

Explanation:
The differences are: 2, 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 22+10=32.

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? 6, 9, 13, 18, ?

A. 22

B. 24

C. 25

D. 23

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Correct Answer: Option B

Explanation:
The differences are: 3, 4, 5. The next difference is 6. Therefore, 18+6=24.

This question belongs to: Reasoning Number Series

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