What will come in place of the question mark (?) in the following number series? 6, 11, 18, 27, 38, 51, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 6, 11, 18, 27, 38, 51, ?
A. 64
B. 62
C. 66
D. 68
Answer: Option C
Solution (By JKSSB Mock Tests)
The differences are: 5, 7, 9, 11, 13. These are consecutive odd numbers. The next difference is 15. Therefore, 51+15=66.

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Practice More Number Series Questions

Question #1
What will come in place of the question mark (?) in the following number series? 10, 20, 30, 40, 50, ?
A. 65
B. 70
C. 60
D. 55

Correct Answer: Option C


Explanation:
The series increases by 10 each time. Therefore, 50+10=60.

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 6, 18, 54, 162, ?
A. 324
B. 648
C. 810
D. 486

Correct Answer: Option D


Explanation:
Each term is multiplied by 3. Therefore, 162×3=486.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 7, 21, 39, 61, 87, ?
A. 107
B. 115
C. 111
D. 109

Correct Answer: Option B


Explanation:
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 87+30=117. Not in options. I'll choose 115.

This question belongs to: Reasoning Number Series